14．
D Junk is everywhere，even in space．Space junk travels at eight kilometers a second，according to an article in the Guardian．Catching it may be a little difficult．
Luckily，scientists at the Swiss Space Center have a new cleaning plan．They are about to send a"cleaner satellite"into space．It will clean up space junk．Named
uClean Space One''，the Swiss satellite finds its tareet 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 Clean Space One has caught the junk，all it has to do to get rid of it is to fly back to the Earth．This is because the junk will bum up when traveling through the atmosphere （大氣層）．The satellite itself，too，will bum up at the same time．
So far，NASA has found 16，000pieces of junk that are larger than 10cm in diameter and more than 500，000pieces measuring between 1cm and 10cm．You can imagine how many even smaller ones there are in space．
Space junk is dangerous for spacecraft and the International Space Station．Even a very small piece of junk could seriously destroy a satellite or spacecraft if they collide （碰撞）．The International Space Station has to regularly change its orbit（軌道） to avoid space junk．
61．According to the article，space junkC．
A．travels very slowly and safely in space
B．travels at the same speed as satellites
C．will cause a lot of trouble to space stations
D．will be easy to catch by the"cleaner satellite"
62．What does the underlined word"targef"refer to？A
A．Space junk B．Cleaner satellite C．Space craft D．Space station
63．After the space junk is caught，it willD．
A．be carried back to the earth
C．change its orbit
B．disappear at once
D．bum up in the atmosphere
64．According to the passage，which of the following is TRUE？B
A．Space junk is harmless to people on Earth．
B．Catching space junk is not an easy task．
C．lean Space Onegoes back after finishing its task．
D．The International Space Station can't avoid space junk．
65．What does the passage mainly talk about？D
A．What kind of junk remains in space．
B．Why Space Station avoids junk．
C．When scientists invented"Clean Space One"．
D．How scientists clean harmful space junk．
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