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　　Alarm System to Help ShenzhouV Avoid Debris

　　ShenzhouV, due to become China’s first manned spaceship when it was sent up last autumn, was fitted with an alarm system to avoid collisions in space．The alarm system kept the spacecraft away from the orbit of space debris(碎片)by automatically changing its propulsion(推進力)and speed．To ensure the smooth launch and return of ShenzhouV, the center was keeping a close watch over the 9,131 pieces of space debris to screen those that were most likely to get in the way of the spaceship．They were making calculations and then putting forward suggestions as to how to avoid collisions．

　　Space experts said the exact launch date was hard to be decided because so many factors are involved, such as the activities of the sun, the temperature, radiation, and the situation in space．

　　Space debris means artificial objects or fragments cast off in the space．With the development of the space industry, the amount of debris has been increasing and now poses potential danger to spaceships, especially manned craft．Since the former Soviet Union sent the first craft into space in 1957, over 26,000 objects have been sent into space by human kind．

　　There search into space debris that might destroy manned spacecraft is greatly significant to China, even though it did not cart until 2000 and is very much behind that in the United States and other countries．

　　China has put into operation an optical telescope(光學望遠鏡)with a diameter of 25 centimetres and will”soon”send up one with a diameter of 65 centimetres．

　　The largest optical telescope in the United States has a diameter of 3．64 meters．China will continue to invest more in research into space debris to reach the international level．

(1)

Which of the following is TRUE of the ShenzhouV Spaceship?

[　　]

A．

It is a satellite used for the weather forecast．

B．

It is China’s fifth manned spaceship

C．

Chinese astronauts flew a spaceship in space for the first time

D．

The launch date of the Shenzhou V spaceship had been decided then．

(2)

The underlined word”collisions”here means ________．

[　　]

A．

collection

B．

gathering

C．

clashing

D．

decision

(3)

The optical telescope in the message is used to ________．

[　　]

A．

watch space debris

B．

study the solar system

C．

watch the orbits of satellites

D．

guide the flight of the ShenzhouV spaceship

(4)

When launching ShenzhouV Spaceship, space experts had to consider the following factors except ________．

[　　]

A．

orbits of some space debris

B．

the mental states of the astronauts

C．

the activities of the sun

D．

the space radiation

答案：1．C;2．C;3．A;4．B;
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