Do you like exercising in the sun？ How much sunlight do you get every day？ How much time do you spend in the（1） ？ As we all know ， enough sunlight is good for our health． It gives us strong bones （骨骼） and good eyesight． It makes us happy and sleep better． Now scientists find out that it can even make you（2） ．
Scientists did tests on mice． They give mice lots of sunlight． After that， the mice （3） _____ a special thing named glutamic acid（谷氨酸） in their bodies． Glutamic acid does many things for our body．It can improve some of our abilities such as learning and remembering things．
It is OK to enjoy some sunlight for about an hour every day． But you should be （4） ____because it is summer now．The sun is very strong around noon．Keep yourself away from the sun around the noon，or it may （5） your skin（皮肤）． It is best to enjoy sunlight in the morning or before sunset．
Why not go out and enjoy the （6） with your family or your best friends？ I'm sure you can be smarter soon．
（1）A． moon |
B． sun |
C． night |
（2）A． smarter |
B． taller |
C． thinner |
（3）A． invent |
B． find |
C． produce |
（4）A． careful |
B． serious |
C． clever |
（5）A． shine |
B． burn |
C． dry |
（6）A． time |
B． air |
C． sunlight |
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How do you "laugh" when chatting with friends on the Internet？ Is it "haha" or "hehe"？ In Thailand， they use "555" （1） their laughter． What other different ways do people use around the world？
It has been quite a long time since people （2） to use online expressions． Some common expressions of laughter include LOL， meaning laugh put out， and ROFL， rolling on the floor laughing． You can see the influence of these expressions everywhere． LOL （3） in Oxford English Dictionary in 2011．
But how do other languages express meaning online symbols？ Most languages follow the rule that they have similar sounds． Sometimes， numbers or letters in one language （4） very different in another． "555" sounds like a person （5） in Chinese， but like laughter in Thai． This is because the number 5 is pronounced "ha" in Thai． "Jaja" is the Spanish way of writing "haha"． In Spanish， "j" is pronounced like the English "h"． Isn't it funny to find these interesting ways to "laugh" ？
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Dear David，
How's it going？ I'd like to tell you about my travel experiences．
Last month， I went to Chengdu （1） my vacation with my parents． Chengdu is in Sichuan， in the southwest of China． It's （2） for its beautiful mountains， forests and lakes． Many people go there to enjoy their vacation every year． We had a five﹣day trip and took many （3） ． We saw pandas and monkeys． They were （4） cute that we couldn't help watching them．
We had an exciting trip! I felt tired but happy． Please e﹣mail me soon （5） about your vacation．
Recently Steve had a car accident and his car was broken． So until the car was （1） he had to go to work by subway． One day， he noticed a （2） guy at the station at night． He felt （3） for him， so he gave him some money．
The homeless guy thanked him for it． The next day again， he noticed the homeless guy at the same place． This time Steve （4） him a meal． The homeless guy thanked him for his （5） ． But Steve got curious（好奇的）and asked， "How did you get to this（6） ？"
（7） a smile， the homeless guy said， "By showing love．" Steve didn't（8） it， so he asked him， "What do you mean by that？" The homeless guy replied， "In my whole life， I made sure that everyone was happy． No matter what happened in my life， I always helped everyone．"
Steve asked him， "Do you （9） it？"， to which the homeless guy replied， "No． It just breaks my heart that the very people I gave money to wouldn't give me a coin （10） I was in need． Son， it is better to build your own house and invite someone in for shelter（庇护）than to（11） them your bricks（砖）while you are building yours． Because one day when you turn around and look at the place where you planned to build your house， it will be an empty （12） ． Then you are the one looking for bricks．"
Steve understood what the homeless guy meant and thanked him for the good （13） ．
Helping others is a good thing． But sometimes， while we are helping others， we （14） our own problems and needs． One must remember that sometimes sharing is better than giving away． You can do a lot more by being in a（15） position instead of bringing yourself into a weaker situation．
（1）A． old |
B． cheap |
C． ready |
D． dirty |
（2）A． rich |
B． homeless |
C． smart |
D． handsome |
（3）A． happy |
B． sorry |
C． angry |
D．excited |
（4）A． told |
B． lent |
C． sold |
D． bought |
（5）A． shyness |
B． sadness |
C． kindness |
D． illness |
（6）A． point |
B． hotel |
C． station |
D． restaurant |
（7）A． For |
B． From |
C． With |
D．About |
（8）A． finish |
B． discuss |
C． describe |
D． understand |
（9）A． regret |
B． need |
C． study |
D．plan |
（10）A． since |
B． before |
C． when |
D． unless |
（11）A． order |
B． offer |
C． show |
D． throw |
（12）A． lot |
B． room |
C． store |
D． house |
（13）A． meal |
B． advice |
C． gift |
D． question |
（14）A． forget |
B． believe |
C． protect |
D． remember |
（15）A． difficult |
B． strange |
C． special |
D． strong |
A young couple decided to go c（1） in the mountains to celebrate their first year of marriage（结婚）． They took with them the t（2） they would need ﹣ warm clothes， food and a tent．
They went up to the mountains and f（3） a fine place to set up their tent． Then they decided to go for a hike（徒步旅行）to see more of the mountains．
A（4） a long hike， they went back to their camp， built a fire and cooked d（5） ． Finally， it was time to go to sleep．
Sometime in the middle of the n（6） ， the wife woke up her husband and said："Look up at the sky． What do you see？ "
Her husband answered，"I see m（7） of stars in the sky． "
His wife said："That's right． W（8） does that mean to you？ "
The husband said："Well， if there are so many stars out there ， that means there might a（9） be a planet just like ours． And if that's true， then there could be life on one of those planets． That's kind of e（10） !"
His wife said："You are wrong． It means that someone has stolen our tent! "
If you've ever stayed up late and then gotten up early the next day， you know what it's like not to get enough sleep． It's very uncomfortable feeling． In fact， for many years scientists （1） （believe） that sleep is like food ﹣ if we don't get enough of it， we might get sick or even die． But now they （2） （start）to wonder just how much sleep we need．
Researchers at Imperial College London did a study on fruit flies（果蝇）． They found that flies that slept for very short periods of time ﹣ about72 minutes a day ﹣still（3） （live） about as long as flies that slept for normal amounts of time． One of the female slept for just 4 minutes each day on average． This has led the researchers to wonder if sleep is less necessary than we previously thought．
Humans are very different from fruit flies． Sleep（4） （help） repair tissue （组织） when our bodies perform a lot of maintenance （维护）． Sleeping allows our bodies（5） （get） well again from the stress we experience each day．
But can we really die from not seeping？ No humans have died so far from （6） （stay） awake for too long． The current（现在的）world record for sleeplessness （7） （hold） by Randy Gardner from the US， who stayed awake for 11 days and 25 minutes in 1964．
Scientist have not yet found any animals that don't sleep at all． Even animals that only seep for short periods are not completely sleepless．
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