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Many people know that rubbish is a big problem on the planet Earth. What many people don’t know is that junk has become a problem in outer space too.
According to BBC News, there are more than 22,000 pieces of space junk floating around the earth. And these are just the things that we can see from the surface of the earth by telescopes. There are also millions of smaller pieces of junk that we can’t see.
Objects, like bits of old space rockets or satellites, move around the planet at very high speed, so fast that even a very small piece can break important satellites or become dangerous to astronauts. If the tiniest piece of junk crashed into a spaceship, it could damage the vehicle.
To make things worse, when two objects in space crash, they break into many smaller pieces. For example, when a U.S. satellite hit an old Russian rocket in 2009, it broke into more than 2000 pieces, increasing the amount of space junk.
To reduce additional space junk, countries have agreed that all new space tools can only stay in space for 25 years at most. Each tool must be built to fall safely into the earth’s atmosphere after that time. In the upper parts of the atmosphere, it will burn up.
Many scientists also suggest different ways to clean up space junk. In England, scientists are testing a metal net that can be fired into space junk. The net catches the junk and then pulls it into the earth‘s atmosphere to burn up. The Germans are building robots that can collect pieces of space junk and bring them back to Earth to be safely destroyed.
“The problem is becoming more challenging because we’re sending more objects into space to help people use their mobile phones and computers,” says Marco Castronuovo, an Italian space researcher.
“The time to act is now. The longer we leave the problem, the bigger it will become,” he says.

单选题 38. Countries want future space tools to be able to fall back into the earth’s atmosphere so that ____.

he tools can be reused later

he tools don’t become space junk

he earth’s atmospheres can stay clean

he effects of space flight can be studied

正确答案：B

解析

本题考查事实细节。
根据题干关键词 “future space tools, fall back into the earth’s atmosphere” 定位到的第五段第一二句 “To reduce additional space junk, countries have agreed that all new space tools can only stay in space for 25 years at most. Each tool must be built to fall safely into the earth’s atmosphere after that time.” 可知，为了减少额外的太空垃圾，各国一致同意所有新的太空工具最多只能在太空停留 25 年。每个工具都必须在此之后安全地落入地球大气层。所以太空工具返回大气层的目的是为了减少额外的太空垃圾。
B项：the tools don’t become space junk 这些太空工具不会变成太空垃圾。符合题意，故选B。
A项：the tools can be reused later 这些工具可以在以后重复使用。不符合题意，故排除。
C项：the earth’s atmospheres can stay clean 地球的大气层能保持清洁。不符合题意，故排除。
D项：the effects of space flight can be studied 可以研究太空飞行的影响。不符合题意，故排除。
故本题答案为B。