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.

【小題1】
A．thousandsB．millionsC．hundredsD．billion
【小題2】
A．a(chǎn)lreadyB．neverC．yetD．just
【小題3】
A．goB．turnC．travelD．goes
【小題4】
A．toB．backC．a(chǎn)roundD．into
【小題5】
A．calledB．callC．callingD．calls
【小題6】
A．sendB．sentC．have sentD．will send
【小題7】
A．outB．beyondC．intoD．up
【小題8】
A．discovered B．discoversC．has discoveredD．have discovered
【小題9】
A．messageB．informationsC．informationD．news
【小題10】
A．WithB．HaveC．UseD．Because


【小題1】B
【小題2】C
【小題3】D
【小題4】C
【小題5】A
【小題6】C
【小題7】B
【小題8】C
【小題9】C
【小題10】A

解析【小題1】根據(jù)后文內(nèi)容可知答案為Where’s your mother?，故選答案為B
【小題2】yet 表示否定句中的也，故選答案為C
【小題3】因?yàn)閕t 作為主語(yǔ)，謂語(yǔ)動(dòng)詞用動(dòng)詞，故選答案為D
【小題4】根據(jù)前文的內(nèi)容可知答案為go around，表示圍著···轉(zhuǎn)，故選答案為C
【小題5】根據(jù)文章內(nèi)容可知答案為被人叫做，故選答案為A
【小題6】根據(jù)上下文的內(nèi)容可知答案為C
【小題7】根據(jù)上下文的內(nèi)容，可知答案為B
【小題8】no one作為主語(yǔ)時(shí)，相當(dāng)于適當(dāng)形式，故選答案為C
【小題9】information為不可數(shù)名詞，故選答案為C
【小題10】with···表示在···情況下，故選答案為A

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