第一节(共15小题;每小题2分,满分30分)
阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项。
A
Junk is everywhere,even in space.But getting rid of space junk is much harder than simply cleaning your bedroom.Space junk travels at 8 kilometers a second,according to an article in TheGuardian.Catching it is a bit of a challenge.
Luckily,scientists at the Swiss space center have a new cleaning plan.They are about to send a “cleaner satellite ” into space within the next five years.It will clean up space junk,according to a report in TheGuardian.
Named “CleanSpace One”,the Swiss satellite finds its target and moves close to it.When it reaches its target,it will catch the junk with a gripping claw(抓手).This is not going to be an easy task because both the satellite and the junk are traveling so fast.
Once CleanSpace One has caught the junk,all it has to do to get rid of it is to fly back to Earth.This is because the junk will burn up when traveling through the atmosphere.The satellite itself will burn up at the same time.
Ever since people started to send objects into space more than 50 years ago,there has been junk in space.Junk on Earth like food wrappers or waste paper is also a problem.But space junk is mainly made up of exploded rockets and broken satellites.If no one cleans them away,they just keep traveling around Earth.
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