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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 37. Why is space junk considered a problem?

It burns up after it re-enters the atmosphere.

It often stops the view of telescopes on Earth.

It could force new space tools to travel at slower speed.

It may crash into other space tools causing damage or death.

正确答案：D

解析

本题考查事实细节。
根据题干关键词 “space junk, a problem” 定位到的第三段整段可知，像旧的太空火箭或卫星碎片一样的物体，以非常快的速度绕着地球运动，以至于即使是一个非常小的碎片也能破坏重要的卫星或对宇航员造成危险。如果最微小的垃圾碎片撞到宇宙飞船上，它也可能会损坏飞船。所以太空垃圾会造成一系列麻烦才会被视作一大问题。
D项：It may crash into other space tools causing damage or death. 它可能撞到其他太空工具上并造成损坏和死亡。符合题意，故选D。
A项：It burns up after it re-enters the atmosphere. 它在重新进入大气层后会燃烧。不符合题意，故排除。
B项：It often stops the view of telescopes on Earth. 它经常阻挡地球上望远镜的视野。不符合题意，故排除。
C项：It could force new space tools to travel at slower speed. 它可能会迫使新的太空工具以较慢的速度行进。不符合题意，故排除。
故本题答案为D。