题目内容
10.Space is where our future is-trips to the Moon,Mars and beyond.Most people would think that aside from comets (彗星) and stars,there is little else out there.But,since our space journey started we have left so much trash there that scientists are now concerned that if we don't clean it up,we may all be in mortal(致命的)danger.The first piece of space junk was created in 1964,when the American satellite Vanguard I stopped operating and lost its connection with the ground center.However,since it kept orbiting around the Earth without any consequences,scientists became increasingly comfortable abandoning things that no longer served any useful purpose in space.
It is estimated that there are now over 500,000 pieces of man-made trash orbiting the Earth at speeds of up to 17,500 miles per hour.The junk varies from tiny pieces of paint chipped off rockets to cameras,huge fuel tanks,and even odd items like the million-dollar tool kit that astronaut Heidemarie Stefanyshyn Piper lost during a spacewalk.
The major problem with the space trash is that it may hit working satellites and damage traveling spacecraft.Moreover,pieces of junk may collide with each other and break into pieces which fall back to the Earth.To avoid this,scientists have invented several ways for clearing the sky.Ground stations have been built to monitor larger pieces of space trash to prevent them from crashing into working satellites or space shuttles.Future plans include a cooperative effort among many nations to stop littering in space and to clean up the trash already there.
28.What was the first piece of man-made space trash?D
A.A camera.B.A tool kit.
C.A fuel tank.D.A broken satellite.
29.Why were scientists NOT concerned about space trash in the beginning?C
A.It no longer served any useful purpose.
B.It was millions of miles away from the Earth.
C.It did not cause any problems.
D.It was regarded as similar to comets and stars.
30.Which of the following statements is true about space junk?D
A.It is huge,heavy machines.
B.It never changes position.
C.It floats slowly around the Earth.
D.It may cause problems for space shuttles.
31.What has been done about the space trash problem?B
A.Scientists have cleaned up most of the trash.
B.Large pieces of space trash are being closely watched.
C.Many nations have worked together to stop polluting space.
D.Ground stations are built to help store the trash properly in space.
分析 本文属于说明文阅读,作者通过这篇文章主要向我们描述了人们制造了许多太空垃圾,因一开始没有引起问题而不受重视,现在发现会影响航天飞机饱受关注.
解答 28.D.细节理解题.根据第二段The first piece of space junk was created in 1964,when the American satellite Vanguard I stopped operating and lost its connection with the ground center可知第一块垃圾是失去控制的卫星;故选D.
29.C.细节理解题.根据第二段However,since it kept orbiting around the Earth without any consequences,scientists became increasingly comfortable abandoning things that no longer served any useful purpose in space可知科学家一开始不关心太空垃圾因为它没有引起任何问题;故选C.
30.D.细节理解题.根据最后一段The major problem with the space trash is that it may hit working satellites and damage traveling spacecraft可知太空垃圾的主要问题是,它可能会损害航天飞机;故选D
31.B.细节理解题.根据最后一段Ground stations have been built to monitor larger pieces of space trash to prevent them from crashing into working satellites or space shuttles可知大片的太空垃圾正在被密切监视;故选B
点评 考察学生的细节理解和推理判断能力,做细节理解题时一定要找到文章中的原句,和题干进行比较,再做出正确的选择.在做推理判断题不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.
A. | why | B. | that | C. | what | D. | whether |
A. | pick out | B. | point out | C. | come out | D. | make out |