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  3. There are three theories about the birth of moon. In the first, the moon is thought to have formed【S1】______ in space, after whi

There are three theories about the birth of moon. In the first, the moon is thought to have formed【S1】______ in space, after whi

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问题     There are three theories about the birth of moon. In the first, the moon is thought to have formed【S1】______ in space, after which it wandered【S2】______captured by the earth’s gravitational field (引力场). The sec and theory is that the moon was【S3】______a part of the earth, then split off and went into orbit. In the third theory, the moon is believed to have developed【S4】______a separate body at the same time as the earth, perhaps from materials left over from the formation of the earth. But, whatever the birth of the moon was like, most scientists agree that the moon became a satellite of the earth soon after the two【S5】______were formed. That would make the moon about 4billion years old.
    However the moon was framed, the fact that men would soon be able to visit it built up new scientific interest in the earth’s nearest neighbor. To many astronomers, the moon had seemed to be a【S6】______un changing world compared with Mars or Jupiter or the distant stars. But the Apollo project changed that. People began to see the moon as a place for great discoveries. As the Nobel Prize winning scientist Harold C. Urey pointed out, the very【S7】______changing surface of the moon makes it a place where the marks of events billions of years old may【S8】______be seen. In that way, the moon is like a window into the very distant past. Robert Jastrow of NASA’s Goddard Space Institute【S9】______it this way: "Because its surface has preserved the record of ancient events, it【S10】______a key to the history of the solar system."

A still             B put             C as             D still
E holds             F until           G once           H body
I point             J somewhere       K star           L get
M dull              N slow            O in
【S3】
选项
答案C
解析 once有“曾经”之意，该句意为“第二种理论认为月球曾经是地球的一部分，后来才脱离它进入卫星轨道”。
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