作业帮Scientists think that there has been life for_ _3 1 _ of yea
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| Scientists think that there has been life for_ _3 1 _ of years. However we haven’t found life on other planets _ 32_ . The earth is a planet and it _33_ _ around the sun. Seven other planets also go _ 34 _ the sun. The sun and its planets are __35 the solar system. The solar system is a small part of our galaxy. Scientists __ 36_ lots of spacecraft to look at other planets in the solar system, and some spacecraft have gone _ _37_ the solar system. However, no one _ _38 _ any life in space yet. But why has no one from other planets sent us a message ? Have they tried to send _ 39_ to us ? _ 40 _so many stars in the universe, are we alone, or is there life out there in space ? We don’t know.
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小题1:B
小题2:C
小题3:D
小题4:C
小题5:A
小题6:C
小题7:B
小题8:C
小题9:C
小题10:A
小题1:根据后文内容可知答案为Where’s your mother?，故选答案为B
小题2:yet 表示否定句中的也，故选答案为C
小题3:因为it 作为主语，谓语动词用动词，故选答案为D
小题4:根据前文的内容可知答案为go around，表示围着···转，故选答案为C
小题5:根据文章内容可知答案为被人叫做，故选答案为A
小题6:根据上下文的内容可知答案为C
小题7:根据上下文的内容，可知答案为B
小题8:no one作为主语时，相当于适当形式，故选答案为C
小题9:information为不可数名词，故选答案为C
小题10:with···表示在···情况下，故选答案为A
Scientists think there has been life on Earth for ______ yea
英语翻译Scientists think that there has been life on Earth for m
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Scientists think that there has been life on Earth for milli
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Scientists think there has been life on Earth for millions o
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英语翻译It has been documented that scientists who first realize
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Scientists have ____ that motion is the source of life
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