One night in February 1962, John H. Glenn. Jr., flew over Australia. The man in the Mercury(水星) capsule（宇宙飞行容器）was alone, but friendly voices reached him by radio. On the dark land 100 miles below, he saw a sprinkling of light. They marked the city of Perth, where people had turned on their lights as a greeting to him.
In Friendship7, Glenn radioed, “ The lights show up very well. Thank for everybody for turning them on.” His capsule raced on to the east.
During his three orbits（绕……轨道而行） of the earth, Glenn could always reach one of eighteen tracking stations. Some of them were on ship at sea. Others were in the United States.
Many of the stations had been built with the help of other countries. These countries allowed Americans to bring in radio equipment and set it up. Without the help of such lands as Nigeria（尼日利亚）, Zanzibar（尚巴西，坦桑尼亚领土的一部分）, and Mexico, there would have been breaks in the worldwide radio network.
John H. Glenn. Jr., was the first America to orbit the earth. For his flight, the tracking network（跟踪网络） covered 60,000 route miles. Five hundred men worked in the stations along the route. Since his flight, the network has grown. Today, it covers more than 100,000 route miles and has about one hundred stations. One-third of these stations are outside of the United States.
This passage is mainly about            .

A．talking to ships at sea around the world

B．breaks in the worldwide network

C．the first American to orbit the earth

D．a satellite which fell into the ocean

From the passage we can see that            .

A．Friendship7 stopped in Perth, Australia

B．all tracking stations are inside the United States

C．radio equipment is important in space flight

D．many people could see Glenn in his capsule when he made the flight

During his flight Glenn could always            .

A．see lights turned on on the ground

B．reach ships at sea

C．reach one of the tracking stations

D．arrive at Mercury in his Friendship7

Why did people in Perth turn on the lights?

A．They wanted guide him to land.

B．It was too dark for them to see in the room.

C．They wanted to see the Friendship7.

D．They wanted to greet Glenn.

Which of the following is not true?

A．Countries must work together to track satellites.

B．There are now about 70 tracking stations in the United States.

C．The tracking network covers many more route miles now than before.

D．Nobody has orbited the earth besides Glenn.