阅读短文，从各题所给的选项中，选择最佳选项．
Imagine the situation．You are driving along a desert or on a mountain．Then your car breaks down．You have no idea where you are．What should we do？Well，next time take a GPS with you．It is a device（设备） which uses satellites to find the user's position．It can find your position within 20meters．A GPS cannot start your car，but at least you will know where you are．
GPS，which means Global Positioning System，is a small radio receiver．It looks like a mobile phone．You can hold it in your hand，or put it in your pocket．It is sometimes put into a watch or a telephone．We also find GPS devices in cars，planes，or boats．Some of these devices have electronic maps，so you know where you are．For example，in a city they can tell you the name of the street．
There are three parts to the Global Positioning System．The first part is the receiver．You can hold it in your hand，or have it fixed into your car，plane，etc．The second part is a group of satellites orbiting（绕） the Earth．The receiver contacts（联络） at least four of the satellites and calculates（计算） its position．The third part of the system is a net work of ground stations．They are all over the world．They control the satellites and make sure theyare working well．
Some people think that in the future the GPS will be as common as the mobile．They are becoming cheaper and more and more accurate（精确的）．There are also new uses for the GPS．Perhaps they will become like watches．Everyone will have one and you will never be lost again．
66．According to the passage，with the help of the GPS，people ．
| A． |
can't be lost in a new city |
| B． |
can't find their way in different countries |
| C． |
can learn about the culture of an unknown place |
| D． |
can find their position within 2000kilometers |
67．We can learn from the passage that ．
| A． |
there are three parts to the GPS |
| B． |
a GPS can't be put into the watch |
| C． |
a GPS can help you start your car |
| D． |
the GPS devices are becoming more and more expensive |
68．The underlined word" they"in paragraph 3means" "．
| A． |
receivers |
| B． |
GPS devices |
| C． |
a network of ground stations |
| D． |
satellites |
69．The passage is mainly about ．
| A． |
the history of the GPS |
| B． |
the introduction of the GPS |
| C． |
the shape of the GPS |
| D． |
the price of the GPS |
70．what can we infer（推断） from the passage？
| A． |
All GPS devices have electronic maps． |
| B． |
People all over the world use the GPS for free． |
| C． |
The receiver of the GPS contacts at least five of the satellites． |
| D． |
The GPS will become more and more common in everyday life． |
Dear Mary，
I've already gotten your e﹣mail.I'm very glad that you are interested in the cultural relics （文物） of China.Let me tell you something about it.
If you want to learn about the cultural relics of our country，you may consider visiting museums or（1） （read）books.Now there is a new way（2） （learn）about the cultural relics.It is to watch a CCTV show（3） （name）National Treasure.Do you want to know more about the new way？Just read on.
National Treasure is a popular show（4） Sunday.It has ten episodes（集）.It shows twenty﹣seven treasures from（5） （ninth）museums across China.
After it first（6） （show）on December 3，2017，it soon became popular.Yu Lei，the（7） （direct）of the show，said that it made national treasures come "alive".
（8） it's a show about old relics，it looks very new and modern.There is a large LED screen on the stage （舞台）.The screen will show every detail（细节）of the treasures.
The show tells the stories and history behind the treasures.It also invites famous actors to act out（9） （this） stories on the stage.The actors even use modern words and sentences in their performances.
A lot of people love the show and they are the fans of National Treasure.One of the fans said，"National Treasure really brings museums and cultural relics（10） people in a modern and interesting way."
So much for National Treasure.Let's talk about it face to face next time.I'm looking forward to seeing you soon.
Yours，
He Ting
Zu Chongzhi was one of the greatest mathematicians（数学家） in ancient China.He was born during the Northern and Southern（1） （ dynasty）.From a young age，Zu was taught natural science，astronomy（天文学），math and so on.The little boy was （2） （ interest） in all of these subjects，especially in （3） .
Zu was best known for his calculation（计算） of pi （π）.According to the record，he did all the work using nothing but wooden sticks. （4） took him lots of time to work out the value —（5） 3.1415926 and 3.1415927.No one at that time was able to do better than Zu.And now the achievement is still praised by people around the world.In order to remember Zu，some mathematicians suggest （6） （call） pi"Zu Lv".
Zu was successful not only in math，but also in astronomy.He worked out that a year should be 365.24281481 days long and created the Daming Calendar. （7） ，government officials at that time did not agree with Zu.The great mathematician （8） saw his calendar put into use.Almost ten years after his （9） （die），the new calendar was finally accepted.
Zu was an inventor，too.He once made a vehicle（车辆） （10） carried a pointer （指针）.No matter how the vehicle turned，the pointer always pointed to the south.
Bicycle riding is good exercise.It helps people become （1）f .Bicycle riding can make the riders' hearts and lungs strong.It is also good for the environment because bicycles do not cause （2） （污染）.
Bicycles share the road with cars and trucks.Drivers do not always notice bicycles.So bicycle riders must （3）p attention to the traffic around them and know traffic signals.They must know and obey the safety （4）r .They must wear helmets to protect their heads.If they ride at night，they should have lights on the bicycle or wear light﹣colored clothes.In case of an accident，bicycle riders should know how to give first aid.If an injury is serious，they must call 120 for help.In a word，the best way to be safe is to be （5） （小心的）.
When we say "we threw something out，" what do we really mean？After all，our waste doesn't just disappear even if it is taken a（1） .So why not recycle it？
Have you ever used newspapers when you clean the windows？If you haven't，please try!I didn't believe it when I（2） （听到）and read that.I thought that they would certainly leave ink（墨汁）or bits of paper behind.Actually，I was so wrong.I have had clearer windows than before s（3） I tried it
When we mention cleaning products，we have to talk about paper towels（手巾）I used （4） to think more paper towels meant a cleaner home.I loved the idea of cleaning with the fresh white paper and then throwing（5） out.But now I know that I have to s（6） using paper towels，because paper towels are a huge waste problem.Cutting out paper towels would save（7） （树），water，air and our money.
Recently.my family and I have started collecting all old （8） （衣服），and then cut them into pieces.Getting one piece to do some cleaning has become our n（9） habit.I thought that it would be such（10） uneasy thing to break a 30﹣year old habit.Whatever，it really is the most meaningful thing that I have done during a long time.
阅读下面短文，在空白处填入适当的内容（1个单词）或括号内单词的正确形式（不超过3个单词）。
Tea is the leaf of a plant which grows widely in China.It is our national drink and tea﹣drinking is one of the daily activities of Chinese people.In China， （1） a visitor comes，he is served with a cup of tea.
Tea﹣drinking has （2） history of over 4，000 years.According to Tea Classics by Lu Yu，tea was discovered by Shen Nong，and became a drink in the State of Lu because of Zhou Gong.According to a legend，Shen Nong tasted hundreds of wild plants （3） （stop） people from eating poisonous （有毒的） plants.One day，he was poisoned by an unknown plant but （4） （save） by eating leaves of an evergreen plant.Later，people called the leaves that saved his life "Cha （tea）".
Drinking tea does good to people in many ways.When people are tired，they feel better after drinking a cup of tea.Compared with people who don't drink tea，tea drinkers are likely to enjoy a （5） （long） life.It is said that drinking tea can also help fat people lose weight.
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