2. 外语
  3. A scientist once said that studying the stars from the earth is【C1】______ looking up at the sky from the bottom of a switching p

A scientist once said that studying the stars from the earth is【C1】______ looking up at the sky from the bottom of a switching p

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问题     A scientist once said that studying the stars from the earth is【C1】______ looking up at the sky from the bottom of a switching pool. Even on the clearest night the earth’s dense atmosphere【C2】______ 30 percent of the light from any star. Air turbulence may cause stars to twinkle.【C3】______  a telescope the stars seem to jump around dizzily.
    Because the moon has no atmosphere, astronomers are looking forward to【C4】______ an observatory there. On the moon, there will be no clouds to【C5】______ the view. The sky will appear dark【C6】______ , so astronomers can work twenty-four hours a day. Because there is no air turbulence, the stars will appear【C7】______ through a telescope.
   【C8】______ the moon is relatively near the earth, moon-based astronomers will see the stars in the familiar patterns known on【C9】______ . They will not need new star maps of the sky. Stars【C10】______ the moon will appear to move very slowly. Because the earth【C11】______  on its axis once every twenty-four hours earth based astronomers see the stars hurry  【C12】______  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【C13】______ still. Moon-based astronomers will have much more time【C14】______  their telescopes and take time-exposure photographs.
    On the earth, mechanical radio noises【C15】______ the airwaves and interfere with the【C16】______ of radio signals from certain stars. A radio telescope【C17】______ on the far side of the moon will be permanently protected from such 【C18】______ .
    It won’t be easy to put telescopes on the moon. However, astronomers are【C19】______ the job can be done. They are convinced that the moon is an【C20】______ place to set up an observatory.
【C20】
选项 A、ideal
B、amazing
C、realistic
D、fantastic
答案A
解析 ideal意为“理想的”；amazing意为“惊人的”；realistic意为“现实的”；fantastic意为“异想天开的”。根据本文第二段，第三段最后两句讲到，由于在月球上可以连续24小时做观察 (月球上是黑暗的)，又由于在月球上观察星星，它们几乎是静止的状态，这些就利于对星星的研究，此外，第四段最后一句又谈到把望远镜安装在离地球较远的月球的那一面，不会受到干扰，如此等等都说明在月球上建立观察站是很理想的。故答案是ideal。虽然，用realistic语义上也通，但句中有冠词an，因而被排除。
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