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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（垃圾） 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（拋棄） things that no longer served any useful purpose in space.
It is estimated （估計）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(飛船). Moreover, pieces of junk may collide（碰撞） 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.
小題1:What was the first piece of man-made space trash­?
A．A camera.B．A tool kit.
C．A fuel tank.D．A broken satellite.
小題2:Why were scientists NOT concerned about space trash in the beginning?
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.
小題3:Which of the following statements is true about space junk?­
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.
小題4:What has been done about the space trash problem­?
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.

小題1:D
小題2:C
小題3:D
小題4:B 

試題分析：文章大意：文章主要介紹太空碎片給太空物體所帶來的危險。
小題1:D細節(jié)理解題。根據文章第二段第一句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.可知答案。故D正確。
小題2:C細節(jié)理解題。根據文章第二段However, since it kept orbiting around the Earth without any consequences, scientists became increasingly comfortable abandoning（拋棄） things that no longer served any useful purpose in space.可知答案。故C正確。
小題3:D細節(jié)判斷題。根據文章最后一段大意可知太空碎片主要對太空的交通工具存在巨大的威脅。故D正確。
小題4:B推理判斷題。根據文章的最后一段Ground stations have been built to monitor larger pieces of space trash to prevent them from crashing into working satellites or space shuttles.可知大的太空碎片被密切的關注。故B正確。
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