【正确答案】 A

【答案解析】[解析]
W: Have you ever thought about all the tons of garbage that's out in space circling the Earth?
M: Tons of garbage circling the Earth? What do you mean?
W: I saw a television program about it last night, and according to the program, there's about 3,000 tons of metal out there in space, traveling at speeds around 17,000 miles per hour.
M: Where did all this garbage come from?
W: Well, it comes from all those space missions that have gone up since 1957. Every time a rocket ship goes up into space, it leaves a lot behind, and this stuff goes into orbit around the Earth.
M: Isn't it dangerous to have all this stuff out there?
W: Some space scientists are worried about possible collisions between this orbiting junk and spaceships, particularly manned spacecrafts; however, so far there haven't been any such accidents.
M: Well, I hope that they're going to do something about this, both for the sake of safety and for the sake of the environment.
W: Me, too. I know that right now the problem is being studied by numerous scientists; hopefully, they'll be able to find solutions before the problem gets too much worse.

综合理解题。第一句话和整个对话内容都说明这个对话内容是关于“围绕地球旋转的数以吨记的垃圾”的，A项符合要求。

【正确答案】 D

【答案解析】细节题。对话中有提到“I saw a television program about it last night．”从而说明女生是在电视节目中获得上述信息的。即D项符合要求。

【正确答案】 B

【答案解析】数字细节题。女生提到“There's about 3,000 tons of metal out there in space．”因而可知，在太空中的金属约3,000吨。B项正确。

【正确答案】 C

【答案解析】在对话最后，女生提到“Hopefully，they'll be able to find solutions before the problem gets too much worse．”言外之意，她相信科学家们会有治理太空垃圾的办法。