请认真阅读下面短文,并根据所读内容在文章后的空格内填入最恰当的单词. 每空格1个单词，不得用文章中的单词。 A scientist once said that

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请认真阅读下面短文,并根据所读内容在文章后的空格内填入最恰当的单词. 每空格1个单词，不得用文章中的单词。
A scientist once said that studying the stars from the earth is something like looking up at the sky from the bottom of a swimming pool. Even on the clearest night the earth’s dense atmosphere will dim stars in the sky as it screens out (遮挡) 30 percent of their light. Air turbulence (湍流) causes stars to winkle. Through a telescope, the stars seem to jump around dizzily.
Because the moon has no atmosphere, astronomers are looking forward to setting up an observatory there. On the moon, there will be no clouds to obscure the view. The sky will appear dark at all times, so astronomers can work twenty-four hours a day. Because there is not air turbulence, the stars will steady through a telescope.
Because the moon is relatively near the earth, moon-based astronomers will see the stars in familiar patterns known on earth. They will not need new star maps of the sky. Stars seen from the moon will appear to move very slowly. Because the earth rotates (自转) on its axis once every twenty-four hours, earth-based astronomers see the stars hurry across the sky each night. The moon rotates on its axis only once a month. To astronomers on the moon, the stars will appear to stand almost still. Moon-based astronomers will have much more time to focus their telescopes and take time ---exposure photographs.
On the earth, man-made radio noises jam the airwaves and interfere with the reception of radio signals from certain stars. A radio telescope located on the far side of the moon will be permanently protected from such interference.
It won’t be easy to put telescopes on the moon. However, astronomers are certain the job can be done. They are convinced that the moon is an ideal place to set up an observatory.
Title : The Reasons for establishing an observatory on the moon

Main Comparison	Context
Different   小题1:	There is very  小题2: atmosphere on the moon.
	On the earth, air turbulence causes stars to twinkle like  小题3: .
Different   小题4:	On the moon, the sky will seem to be in   小题5: .
	Because of clouds, there is a  小题6:  view from the earth.
Different   小题7:	Earth-based astronomers see stars move very  小题8:
	Stars are seen on the moon to move at a very low   小题9:
In contrast	The moon is   小题10:  to be an ideal placeto set up an observatory.

 

答案

小题1:conditions
小题2:thin
小题3:flashlight
小题4:outlook
小题5:darkness
小题6:vague
小题7:speeds
小题8:fast
小题9:rate
小题10:sure/ certain

解析

试题分析：文章介绍在月球上观察星星的优点，月球上没有大气，看星星更清楚，月球是最接近地球的，因此环境也是相似的，月球上24小时都是黑暗，观测条件更好。
小题1:归纳词：从右边的内容可知是对比地球和月球的观察条件：conditions
小题2:从第一段的句子：Even on the clearest night the earth’s dense atmosphere will dim stars in the sky as it screens out (遮挡) 30 percent of their light. 可知地球上的大气比较稠密，月球上是比较稀薄：thin
小题3:从第一段的句子：Air turbulence (湍流) causes stars to winkle. Through a telescope, the stars seem to jump around dizzily.可知从地球上看星星会象手电筒一样一闪一闪的，填flashlight
小题4:归纳词：从右边的内容可知是对比地球和月球不同的景色：outlook
小题5:从第二段的句子：On the moon, there will be no clouds to obscure the view. The sky will appear dark at all times, 可知月球上一直是黑暗的：darkness
小题6:从第一段的句子：Even on the clearest night the earth’s dense atmosphere will dim stars in the sky as it screens out (遮挡) 30 percent of their light.可知因为有云，在地球上看星星是模糊的： vague
小题7:归纳词：从右边的内容可知是对比地球和月球上的星星的速度：speeds
小题8:从第三段的句子：Because the earth rotates (自转) on its axis once every twenty-four hours, earth-based astronomers see the stars hurry across the sky each night. 可知地球上看星星移动的很快：fast
小题9:考查词组：at a low rate速度慢，
小题10:从最后一段的句子：However, astronomers are certain the job can be done. They are convinced that the moon is an ideal place to set up an observatory.可知月球一定是理想的观测点： sure/ certain