答案:D
22.What will happen to the space junk if it is not cleaned up?
A.It will explode in a few years.
B.It will keep traveling around Earth.
C.It will drift away from Earth eventually.
D.It will gather and become a large mass.
解析:推理判断题。从第五段最后一句“Ifnoonecleansthemaway,theyjustkeeptravelingaroundEarth.”可知B项正确。
答案:B
23.Which of the following is TRUE about a “cleaner satellite”?
A.Catching space junk is difficult for a satellite.
B.The junk is dealt with after the satellite reaches Earth.
C.The satellite can catch several pieces of junk at once.
D.The satellite goes back to space after it has finished its task.
解析:细节理解题。从第三段最后一句“Thisisnotgoingtobeaneasytaskbecauseboththesatelliteandthejunkaretravelingsofast.”可知A项正确。从第四段第二句中的“...thejunkwillburnupwhentravelingthroughtheatmosphere.”可知太空垃圾会在卫星返回地球时在大气层被烧掉,而不需要再回到地球处理,B项错误;C项文中没有提及;从第四段最后一句“Thesatelliteitselfwillburnupatthesametime.”可知卫星本身也会烧掉,所以卫星不会再次回到太空,D项错误。
答案:A
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