There were three big fish in the lake．One of them，Demo，was wise；another one，Jimmy，was half﹣wise；Martin，the third one，was stupid．
Some fishermen came to the bank of the lake with their nets．The three fish saw them．
Demo decided at once to leave，to make the long and difficult trip to the ocean．He thought，"I won't discuss with these two about this．They love this place so much that they call it home and will stay on．How silly they are!They still haven't realized we are in great danger now．Their ignorance will cost them their lives．"
Seeing the wise fish had left，Jimmy thought，"My guide has gone and now I've lost my chance to escape．"He felt sorry for it and then thought，"What can I do to save myself from these men and their nets？Perhaps I should pretend （假装）to be already dead，giving myself totally to the water．"So he did that．He went up and down with the water，helpless，within arm's reach of the fishermen．
"Look at this!The best and biggest fish is dead．"One of the men lifted him by the tail，and threw him up on the ground．He rolled （滚动）over and over and moved secretly toward the water，and then，back in．
The third fish was aimlessly jumping about，trying to escape with his speed and cleverness．The net，of course，finally closed around him，and as he lay in the hot frying﹣pan bed，he thought，"If I get out of this，I'll never live again in the limits of the lake．Next time，the ocean!I'll make it my home．"
56．The passage is a
A．diary
B．story
C．notice
57．The underlined word"ignorance"in the passage means" "in Chinese．
A．冲动
B．勇气
C．愚昧
58．Jimmy thought that he could escape from the fishermen by ．
A．traveling to the ocean
B．pretending to be dead
C．jumping here and there
59．Who was caught by the fishermen at last？
A．Demo
B．Jimmy．
C．Martin．
60．What can we learn from the passage？
A．It is important to make proper changes in time．
B．Good chances are always given to the honest．
C．The stupid can also succeed with great efforts．
"Please take my penny（便士）．" Maggie said to old Dan， the fisherman， who sat on a bench repairing his net．"Please take it．" She said again． Old Dan smiled， and took it． "Thank you， little girl．" he said．
After that，Maggie went to the beach to collect sea shells．She never thought how fast time went by．Two hours later，she sat down on a rock beside a little pool，and Dan's large dog Rover jumped down from a rock! He made a loud noise， and then began to pull her coat gently．"Rover wishes me to leave here，I see．" she said， and she rose from the rock and began to go home．However，she found the places she had got down easily was now very difficult to climb up， and because the tide（潮水）had been in for some time， she found some of the stones wet and smooth．
What could poor Maggie do？ She felt sad and cried， but the tide made a much louder noise than she could make． Rover jumped upon a big stone and raised his loud bark until even the tide could not drown（淹没）it． Finally， Dan heard the loud barking of the dog．He came in a boat and brought Maggie and Rover safely to the land!
"It was the penny that did it， madam．" Dan said to Maggie's mother later， " I saw Rover looking at her when she put the penny so kindly into my hand﹣﹣just as if he would have said，'Rover will be your friend now， little girl．' And I am thinking he has looked after her all day，because he never came near me after that．"
Some years later， Rover came to Maggie's home with a little note， in which was written﹣﹣﹣"Will Maggie help Rover？ ﹣﹣﹣his master is dead．"
（1）What is Maggie like according to the passage？
| A． |
Smart |
| B． |
Kind |
| C． |
Creative |
| D． |
Brave |
（2）Who brought Maggie to the land safely in the end？
| A． |
Rover |
| B． |
Maggie's mother |
| C． |
Herself |
| D． |
Old Dan |
（3）Which is the RIGHT oeder of the following events？
①Maggie went to the beach to play．
②Rover barked for help and they were saved．
③Maggie gave a penny to Dan， the old fisherman．
④Maggie found i t hard to get back from the rock．
| A． |
①③④② |
| B． |
③①④② |
| C． |
③①②④ |
| D． |
①③②④ |
（4）Why did Rover look after Maggie all day according to Dan's words？
| A． |
Because Rover noticed Maggie's kind action and felt like being with her． |
| B． |
Because Maggie was a friend of Dan's family． |
| C． |
Because Maggie often came to play with Rover． |
| D． |
Because Rover was a naughty dog and liked to play with little kids on the beach． |
（5）What is the best title for thepassage ？
| A． |
Rover and his master |
| B． |
Rover's new friend |
| C． |
A brave dog |
| D． |
What Maggie's penny did |
People already know a lot about animals． However， there are still some things about animals that may surprise you． Here are some facts about animals you probably didn't know．
Cows do have best friends and feel stressed when they are separated． Scientists have found that cows are very social animals and a cow always makes friends with other cows． When a cow is with its friends， it feels relaxed， compared with when it is alone．
During breeding season， a male penguin（企鹅）will offer a small stone to a female penguin as a gift． If she takes it， they will become partners． When the female penguin lays an egg， she and her partner may carry it on their feet， because some penguins don't build nests（鸟巢）．
Crocodiles（鳄鱼） swallow（吞）stones． Crocodiles always swallow their food instead of eating it like other animals． They swallow stones which break the food into very small pieces in their stomachs． These stones may stay in their stomachs all their lives．
Elephants use plants to treat pain or other illness． Scientists once found a pregnant（怀孕的） elephant in Africa who ate a kind of plant which was not part of her normal food． Four days later， she gave birth to a baby elephant． The same plant was used by the local pregnant women．
根据短文内容，判断下列句子正误．正确的用"A"表示，不正确的用"B"表示．
（1）A cow hates making friends with other cows．
（2）All the male penguins will build nests if the female penguins lay eggs．
（3）Crocodiles swallow stones to help with digestion （消化）．
（4）Elephants eat plants only when they are hungry．
（5）The passage mainly tells us some surprising facts about animals．
Mr．Black was too fat．His wife was worried about his health and took him to see a doctor．"Don't eat meat or cakes，" the doctor said to him．"I'm going to stop him from eating them，doctor，" his wife said．
The next morning ，Mr．Black made a nice cake， and his wife ate half of it．After his wife went out，Mr．Black cut a very small piece of the cake and ate it．It was very delicious．Then he cut a bigger piece of it and ate it．In several minutes， he finished the rest of the cake．"My wife will be very angry，" he said to himself．" What should I do？"Then he had an idea．He made another cake very quickly， ate half of it and left the other half on the table．When his wife came back at noon，she was very happy to see the half of the cake．
（1）What was the matter with Mr．Black？
| A． |
He was too heavy． |
| B． |
He slept too long． |
| C． |
He was too worried． |
| D． |
He had too much stress． |
（2）Who made the cake？
| A． |
The doctor． |
| B． |
Mr．Black． |
| C． |
The doctor's wife． |
| D． |
Mr．Black's wife． |
（3）In the morning，Mrs．Black ate ．
| A． |
half a cake |
| B． |
one cake |
| C． |
one and a half cakes |
| D． |
two cakes |
（4）Why was Mrs．Black happy to see the half of the cake？
| A． |
Because she saw her husband waiting for her． |
| B． |
Because the cake on the table was very delicious． |
| C． |
Because she was hungry and wanted to eat the cake． |
| D． |
Because she thought her husband didn't eat the cake． |
Once upon a time，a fox was walking along a road．He saw some beautilul grapes hanging over a high wall．He stopped to look at the grapes．They looked nice to eat．The fox wanted to eat the grapes very much，but he couldn't reach them．So he jumped as high as he could．Sometimes his nose touched a grape，but his mouth could not reach it．The fox jumped and jumped until he was very tired．
Finally he stopped jumping and walked away with his nose held high．He said，"I don't need those grapes．They look nice but I'm sure they are sour．"
In our dailly life，when people can't get something they want，they may say，"The grapes are sour．"
根据短文内容，判断句子的正误，正确的填T，错误的填F．
（1）The fox was walking along a river．
（2）The grapes were beautiful and looked nice to eat．
（3）The fox didn't want to eat the grapes very much．
（4）The grapes were too high for the fox to get．
（5）Today，when people can't get what they want，they often say it's not good． ．
Snowy was a little cat． He lived with a little old lady who loved Snowy very much． Sometimes the old lady would sit in her rocking chair， rocking backwards and forwards until she fell asleep or sometimes she would play little tunes（曲子） on her piano．
One sunny day， Snowy jumped up on the window sill（窗台）． Snowy wanted to go out and play with the pretty butterflies， but the window was shut and the old lady had fallen asleep in her rocking chair．
He ran to the door but that was shut， too． He sat down near the old lady's feet and said， "Miaou？" That was his way of saying， "May I go out to play， please？" The old lady didn't hear him but stayed fast asleep．
He rubbed his soft head against the old lady's legs． Still the old lady slept． So Snowy sat down and thought hard． Then he had an idea． He would jump up on the piano and play a tune． That might wake her up． So Snowy jumped up onto the piano and was a little scared of the loud， big， deep drum sound he made as he landed．
He took another little step． It wasn't quite such a loud note（调子）． Up and down the notes he walked until he reached the very high notes which sounded like lots of bells． But still the old lady slept． Snowy kept dancing about on them and made quite a pretty tune． At last the old lady woke up．
"What are you doing， Snowy？" She asked but she wasn't angry． "Miaou，" said Snowy， running to the closed door． "How clever you are to wake me up by playing the piano!" said the old lady as she let Snowy out into the sunshine．
（1）Where did the old lady often fall asleep？ （within 4 words）
（2）What did Snowy want to do by jumping onto the window sill？ （within 10 words）
（3）What did Snowy jump on the piano to do？ （within 10 words）
（4）How did Snowy feel when he landed on the piano？ （within 5 words）
（5）What did the old lady do in the end？ （within 10 words）
Every year animals all around the world take part in some wonderful journeys．Here are the stories of two amazing animal travelers．
Humpback whales （ 座 头 鲸 ） prefer a slow journey．The humpbacks，
which travel over 10，000 kilometers on their journey from Alaska to Hawaii，swim at a relaxing speed of
about 1.6 kilometers an hour．Although they don't swim fast，humpback whales travel farther than any other kinds of whale．
Every August a fantastic sight can be seen in the skies above Ontario and Montreal﹣﹣millions of amazing
Monarch butterflies （ 帝 王 蝶） beginning their 4，000﹣﹣kilometer journey from Canada to Central Mexico．In fact，the journey，
which takes about 3 months，is longer than the average （ 平 均 的 ） life of the butterfly．Finally many
of the butterflies reaching their final place are the great grandchildren or even the great great grandchildren of the butterflies who began the journey in Mexico the year before．
任务一根据文章内容，完成下列句子．（每空不超过3个单词）
Humpback whales swim at a speed of （1） an hour from Alaska to （2） ．They travel slowly but （3） among all whales．Monarch butterflies spend（4） flying from Canada to Central Mexico．It lasts longer than their average life．The ones which arrive at the final place are （5） or even the great great grandchildren．
任务二请用英语简要概括出本文的主旨大意，不超过10个单词．
The passage is mainly about ．
Once upon a time there was a blackbird that lived in a cherry （樱桃）tree outside my window． Every day the blackbird would sing and sing． When I ate my breakfast， the blackbird ate his breakfast． When I ate my lunch， the blackbird ate his lunch． When I ate my dinner， the blackbird ate his dinner． The blackbird always ate the cherries off the cherry tree outside my window．
One day， Mother was gong to make a cherry pie． We picked all the cherries off the cherry tree． When it was baked， she put the pie by the window to cool off． While I was eating my breakfast， I saw the blackbird fly around the tree． But there were no cherries on the tree． He flew in through the window to sit by me then over to the window by the pie． I smiled． The blackbird looked at me and smiled， too． He said " I 'll have my pie without ice cream! " And with that， the blackbird took the pie under his wing and flew out of the window． I rushed out of the house and saw the blackbird eating the pie! Soon ， the whole pie was gone． We looked at each other and smiled．
76． Where did the blackbird live？ （ No more than 8words）
77．What did the blackbird have for his meal？（No more than 2words）
78．What did the writer and his/her mother do before making a pie？ ？（No more than 5words）
79．Why did the writer's mother put the pie by the window？ （No more than 4words）
80．Who ate the whole pie？ （No more than 2words）
Animals are our friends． Sometimes they make trouble， but sometimes they can help us．And they hope to live a happy life， too． Here are two real stories from our readers．
The first story is from Ray．"My cat， Tiger， hates it when I use my iPad because it takes my attention away from him． One year， I had a fall at home and was on the floor for 16 hours， During this time， I was unable to move and couldn't get to the phone to call for help． Tiger stayed by my side until he disappeared under my bed． 'What's he up to？' I wondered． To my surprise， he started to push something towards me． It was my iPad，which I didn't realize had fallen off the bed and onto the floor．He probably didn't know what it was， but he knew that it made me happy． Thanks to Tiger， I was able to communicate with my friend， Becky， who then told my doctor．"
The second story is from Colin． "Years ago， my friend Julius saved a bird﹣a wild 'Mom' cockatoo（鹦鹉） from the side of the road and kept it as a pet in a big cage（笼子）．It lost one of her wings， so she was unable to return to the wild． Soon， two wild cockatoos came visiting and one 'Dad' bird wanted to find his way into the cage． The 'Mom' cockatoo in the cage was soon expecting． But as she couldn't fly，'Dad' cockatoo built a home in the tree， keeping off everyone who got close to 'Mom' cockatoo． 'Baby' cockatoo would spend his days flying off with his dad， leaving his mom behind．She would sit and wait until they returned home each afternoon．The family stayed together happily．"
After reading the stories， don't you think we should get along well with animals？ No matter they are our pets or live in the wild， they have their feelings． We should respect every life in the world．
（1） is the owner of the cat．
A． Becky
B． Julius
C． Colin
D． Ray
（2）The underlined word "it" in Paragraph 2 refers to the ．
A．phone
B． cat
C．iPad
D．bed
（3）"Mom" cockatoo didn't return to the wild because ．
A．Julius caught it as a pet
B． She was badly hurt and couldn't fly
C． she preferred the life in the cage
D．"Dad" cockatoo built a home in the tree
（4）The main idea of the passage is that ．
A． Ray， Becky and Colin are animal lovers
B． we shouldn't use iPad too much
C． friends should help each other
D． we should respect every life in the world
（5）In which part of a newspaper would you probably read the passage？
A． Sports news．
B． People and animals．
C． Health．
D． Travel．
We have heard about people who have special memories．Recently there has been a report about a woman from Australia who can remember almost every detail （细节） of all the events in her daily life．
Rebecca Sharrock，25，is one of just 80people worldwide who have been identified（确定） as having Highly Superior Autobiographical Memory （HSAM，超级自传体记忆症）．It means she can remember every small event﹣which most people would forget with in （在…以内） days﹣as if it had happened just minutes ago．
"I remember my mum putting me in the driver's seat of a car and taking a picture of me when I was 12days old，"she said．"That's my earliest memory．I remember every day since then．I can't tell all the dates exactly because I was too young to understand calendars，but I remember what I did that very day，what the weather was like and so on．"
Rebecca can also re﹣experience taste．If she's eating something that she doesn't like，she thinks about Black Forest cake，her favorite food，and the memory will be so strong that she can nearly"taste"it．
However，sometimes her memories prove （证明） to be painful．Because they're not just events that she remembers．"When I relive （再体验） memories，the feelings return，too，"Rebecca said．"For example，I remember falling over when I was three at my grandparents' house and hurting my left knee．Talking about it now，I feel painful in my left knee．"
"At night，I have to sleep with the radio/recorder and a soft light on，n she added．"1f it's too dark or quiet，my mind would be filled with all these memories and I can't sleep．"
51．Which is NOT TRUE about Rebecca？
A．She has special memories．
B．She is from Australia．
C．She is 25years old．
D．She can remember every detail of all the events．
52．What happened to Rebecca on the day when she was 3years old？
A．She was identified as having HSAM．
B．Her mother put her in a car and took a picture of her．
C．She started to understand calendars．
D．She hurt her left knee at her grandparents'．
53．Whenever she is reliving her memories，
A．she is happy
B．she experiences the feelings again
C．she feels pain in her knees
D．she can taste her favorite food
54．What is the result of having HSAM？
A．She can remember every event in her daily life．
B．She can re﹣experience taste．
C．She can relive feelings．
D．All the above．
55．From the passage，we can infer （推断） that
A．HSAM can do her good，but it also brings her pain
B．she feels painful if she recalls her experiences
C．she can fall asleep while she is re﹣experiencing memories
D．HSAM can greatly improve her living conditions．
Once upon a time，a hippo（河马）lived in a river next to a big tree．
One day，a bird came and nested （筑巢）in the tree．The songs of the bird filled the hippo with so much envy（羡慕）that he couldn't think of anything else．Every day he would think why he wasn't born to be a bird even though the bird told him many times he was so lucky to be so big and such a good swimmer．
Finally，the hippo made up his mind that he would come out of the river，climb the tree and start singing．However，when he tried to climb the tree，it was very clear that the hippo didn't have wings to fly，or claws to climb with．
Realizing that he would never climb up the tree，he angrily hit the tree until it came crashing to the ground．Then he stepped onto the leaves of the fallen tree，and began singing．
Unfortunately，hippos can't sing，either．All that came from his mouth were terrible noises，and when the other animals heard this，they all came around to make fun of the hippo．
He was so ashamed by this．He also felt bad about having knocked the tree over．He used all his strength to raise the tree back up again，and look after it until it completely recovered（康复）．
Complete the summary of the passage above with one word for each blank.
Once upon a time，there was a hippo living in a river next to a big tree.He （1） the bird's singing.He wondered why he wasn't （2） in singing songs.
Finally，the hippo （3） to come out of the river，climb the tree and start singing.Unluckily，he （4） to climb the tree.He was so angry that he hit the tree until it fell over.Then he began to sing on the leaves of the fallen tree.But he couldn't sing，either.Other animals came to （5） at him because of his terrible noises.
At last，he felt ashamed to knock the tree over.He tried to help the tree recover.
After Donald Trump became the 45th American president，a new video of his granddaughter Arabella went popular once again on the Internet．In this video，the little girl wore a qipao，a kind of traditional Chinese dress．She stood in front of a table to recite（背诵） ancient Chinese poems．These poems are familiar（熟悉的） to most Chinese people and they are often recited by Chinese kids．Arabella made the video to remember Chinese Monkey Year ，which ended on January 27th，2017．
Arabella's family are interested in Chinese culture．They can even make Chinese dumplings and sing Chinese songs．Arabella began to study Chinese when she was 18 months old．Now she can speak very good Chinese．Early in February，2016，4﹣year﹣old Arabella，recited a Tang Dynasty poem in Chinese．Her mother sent her video online and won lot of"likes"from all over the world．
On Sonia Weibo，many users thought Arabella was a wonderful and surprising girl．"I'm glad to see the little angel（天使） loves Chinese culture，"wrote a user called"orange"．
"At least the video shows that Trump is serious about education and never closes the door to foreign culture，"said another user named"stAU79"．
71．What did Arabella wear in the new video？（根据短文内容回答问题）
72．When did Arabella begin to learn Chinese？（根据短文内容回答问题）
73．How old is Arabella now？（根据短文内容回答问题）
74．从文中找出与下面句子画线部分意思最接近的单词．
"I'm glad to see the little angel loves Chinese culture，"wrote a user called"orange".
75．The underlined word" they"refers to ．
An elephant and a crocodile were once standing beside river． They were disputing which was the better animal．
"Look at my strength， "said the elephant． "I can pull up a tree， roots and all， with my trunk．"
"Ah! But your skin is not nearly so thick as mine， "replied the crocodile． "No knife or tooth can cut through it．"
Just as they were coming to blows， a lion happened to pass．
"My dear friends !" said the King of all animals， going up to them． "Let me know the cause of your disagreement．"
"Will you kindly tell us which is the better animal？ "cried both at once．
"Certainly， "said the lion， pointing across the river． "Do you see the soldiers metal hat on that wall？"
"Yes! "replied the beasts．
"Well， then， "continued the lion， " go and get it， and bring it to me， and I shall be able then to decide between you．"
Upon hearing this， off they started．The crocodile， being used to the water， reached the opposite side of the river first， and was soon standing beside the wall．
Here he waited till the elephant came up． The elephant， seeing that the crocodile had no way of reaching their goal， raised his long trunk， and took down the hat quite easily．
They then made their way together back again across the river． The elephant was trying to keep up with the fast﹣moving crocodile in the water and became careless． When he was forced to turn sharply to avoid a floating tree branch， the elephant dropped the hat and it fell to the river bottom． The crocodile noticed the accident， so down he dived， and brought it up in his huge mouth． They then returned， and the crocodile laid the metal hat at the lion's feet． The King took it up， and turning to the elephant， said："You， because of your size and trunk， were able to reach the hat on the wall but， having lost it，you were unable to get it back． And you， said the lion to the crocodile， "although unable to reach the hat， were able to dive for it and save it． You are both wise and able in your own ways． One is no better than the other．"
（1）The underlined word"disputing"in Paragraph 1 means ．
A． playing
B． quarrelling
C． complaining
D． deciding
（2）What did the crocodile think was best about himself？
A． His big mouth
B． His strong skin
C． His swimming skill
D． His dangerous teeth
（3）How did the lion deal with the animals disagreement？
A． He ordered them to fight．
B． He made a quick decision．
C． He suggested a competition
D． He asked them to describe themselves
（4）What caused the elephant to drop the hat？
A． The hat got wet in the river．
B． He hit a floating tree．
C． He was trying to swim too fast
D． He wanted to fight the crocodile
（5）How were the elephant and the crocodile able to complete their task？
A． By working together
B． planning carefully
C． By sharing their ideas
D． By listening to the lion
The next time Wayde saw Manningtree， he said， "Could you let me have a little of that medicine？ Just enough to see if it works． I'm sorry to trouble you．"
"I have only a very small amount left． It will take me some time to find out how to make more．"
"I will pay you anything you ask，" Wayde said．
"Don't give me anything now， but promise to pay me ﹩10，000 when you become Prime Minister （首相）．"
Wayde laughed． "That's impossible，" he said．"I shall never become Prime Minister．"
"Who knows？" Manningtree said． "Give me a week， and I'll see what I can do．"
A week passed． Then， Manningtree came to visit Wayde again． He brought with him a small bottle．
"I cannot find out how to make more of this medicine，" he said，"but you can have what's left．I don't need it anymore．"
"That's very generous of you，" Wayde said．"How can I ever thank you'？"
"Just take one small drop of the medicine once a month．" Manningtree said．
Wayde took the bottle from his friend． Once a month， he look one small drop．
The effect（效果）was immediate．Suddenly，he was not nervous anymore．He was not shy anymore，either， He was confident of his abilities．
He started a business and within a year became a millionaire． He met and married one of the country's most intelligent and beautiful women and had two lovely children with her．He ran for parliament （议公）and succeeded． Within two years， he was a minister． Two years later， he became Prime Minister．
One day， he went to see Manningtree．
"You have come to give me ﹩10，000，" Manningtree said with a laugh，"Forget it．I don't want it．"
"You can certainly have it if you want it，" Wayde said．"But that is not the reason I have come to see you．"
"Oh？ And what is the reason？" Manningtree asked．
"I have almost finished the medicine you gave me，"Wayde said．"Have you found out how to make it'？"
Again Manningtree laughed．"Oh， yes，" he said． "I have known how to make it for a long time．I knew how to make it when I was at school．"
"What do you mean？" Wayde asked．
"My dear friend and Prime Minister，" Manningtree said，"the medicine I gave you was just a bottle of distilled water．"
"But the colour．"
"Oh， I added some coloring．"
"Then， the medicine did me no good，" Wayde said．
"It didn't need to． There was nothing wrong with you． All you needed was to have confidence in yourself．"
（1）The story is organized ．
A． in time order
B． in space order
C． from specific lo general
D． from general to specific
（2）What happened to Wayde after taking the medicine？
A． He got rich in a week as expected．
B． He suddenly got nervous and shy．
C． He succeeded in becoming Prime Minister，
D．He became the most intelligent man in the country．
（3）Why did Wayde come to see Manningtree years later？
A． To say thanks lo the doctor，
B． To ask for more of the medicine．
C． To pay for the medicine．
D． To give the rest of the medicine back．
（4）What do we know about the medicine？
A． It cost Wayde﹩10，000．
B． It was useful but expensive．
C． It didn't work well on Wayde．
D． It was made up of water and coloring．
（5）What can we Iearn from the story？
A． Confidence is the secret of success．
B． A friend in need is a friend indeed．
C． Helping others is helping ourselves．
D． Too much medicine is bad for health．
35．What is NOT included？
A．When to have the party．
B．Where to have the party．
C．What colour to wear at the party．
D．What activities to do at the party．
36．What never grows in one's life？
A．Eyes B．Nose
C．Ears D．Hair
37．What is this passage mainly about？
A．A lucky camel's story．
B．John's unusual experience．
C．How John got home from work．
D．A camel running away from the zoo．
38．What is the best title for this passage？
A．How insects communicate with each other
B．How insects communicate with willow trees
C．How willow trees communicate with each other
D．How willow trees send out a special smell．
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