Scientists think that there has been life for__31_ of years. However we haven’t found life

Scientists think that there has been life for__31_ 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.
【小题1】A．thousandsB．millionsC．hundredsD．billion【小题2】A．alreadyB．neverC．yetD．just【小题3】A．goB．turnC．travelD．goes【小题4】A．toB．backC．aroundD．into【小题5】A．calledB．callC．callingD．calls【小题6】A．sendB．sentC．have sentD．will send【小题7】A．outB．beyondC．intoD．up【小题8】A．discovered B．discoversC．has discoveredD．have discovered【小题9】A．messageB．informationsC．informationD．news【小题10】A．WithB．HaveC．UseD．BecauseB

(答案→)B 解析：【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

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