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 ground 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.

41.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 spend the least time getting to another place

42.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

43.The underlined word “They” in paragraph 3 means “____________”.

A. Receivers B. GPS devices C. Satellites D. Ground stations

44.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

45. What can we infer(推断) from the passage?

A.All GPS devices have electronic maps.

B.People in many countries will 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.

非选择题(共51分)

四、填空(共16小题;每小题1分，满分16分)

A)根据括号中所给的汉语写出单词，使句子意思完整正确，并将答案填写在答题卡标号为46-50的相应位置上。

46.The school library is ▲ (开放的) Monday through Friday, 9a.m to 6 p.m.

47.I often ▲ (买)gifts for my parents on their birthdays.

48.The children all ▲ (跳)with joy when they heard the good news.

49.Where are you going to put your ▲ (自行车)? It’s so cro