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_

◎ 题干

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．thousands

B．millions

C．hundreds

D．billion

小题2:

A．already

B．never

C．yet

D．just

小题3:

A．go

B．turn

C．travel

D．goes

小题4:

A．to

B．back

C．around

D．into

小题5:

A．called

B．call

C．calling

D．calls

小题6:

A．send

B．sent

C．have sent

D．will send

小题7:

A．out

B．beyond

C．into

D．up

小题8:

A．discovered

B．discovers

C．has discovered

D．have discovered

小题9:

A．message

B．informations

C．information

D．news

小题10:

A．With

B．Have

C．Use

D．Because

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◎ 解析

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◎ 知识点

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