Imagine the situation. You are driving along a desert or on a mountain. You have no idea where you are. You passed the last house two hours ago, Then your car breaks down. It is night and it is cold. You have no mobile phone. What do you do? Well, next time take a GPS with you. This invention may be able to help you .It is a device(装置)which uses satellite(卫星)to find the user’s position(位置).It can find your position to within 20 meters. 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 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 device 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 the Earth. The receiver contacts at least four of the satellites and calculates(计算)its position. The third part of the system is a network of group stations. They are all over the world. They control the satellites and make sure they are 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.

1.According to the passage,with the help of 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 spend the least time getting to another place

2.We can learn from the passage that_____________.

A. there are three parts to the GPS

B. a GPS can’t be put into a watch

C. a GPS can help you start your car

D. the GPS are becoming more and more expensive

3.The underlined word “They” in paragraph 3 means “__________”

A. Receivers B.GPS devices

C. Satellites D. Ground stations

4.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 three parts of the GPS

根据短文内容回答问题。

CCTV reported that every year Chinese people throw away a lot of food which can feed 200 million people for a year. Do we have too much food ?Of course not. According to the UN World Food Program, there were 925 million hungry people all over the world in 2013. About six million children die of hunger every year.

So think about it. We should say no to people who waste food every day. An old saying goes, Luckily, a number of people have realized the importance of saving food. Li Hong, a waitress in a restaurant in Jiangsu, once lost her job because she took some leftover(剩余的) food home for her son. But many people were by her side and criticized (批评) the waste of food.

What should we do in our daily life to stop wasting food ?We can do many things to prevent it from happening. Here are some tips: 1.Don't order too much food in a restaurant. Only order as much as you can eat. If you can’t eat all the food you order, take the rest of it home.

2. Don’t be too picky(挑剔的) about food.. some food may not be tasty, but your body needs it.

3.Don’t keep too much food at home, especially for fruit and vegetables.

“Every grain on the plate comes from hard work.”(谁知盘中餐,粒粒皆辛苦) It tells us everybody must save food.

1.How many hungry people were there all over the world in 2013 ?

____________________________________________________

2.Why did Li Hong lose her job ?

____________________________________________________

3.What should we do if we can’t eat all the food we order ?

_____________________________________________________

4. Can you keep too much food at home ?

______________________________________________________

5.What can we learn from the passage ?

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