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  3. In 1961, scientists set up gigantic, sensitive apparatus to collect radio waves from the far reaches of space, hoping to discove

In 1961, scientists set up gigantic, sensitive apparatus to collect radio waves from the far reaches of space, hoping to discove

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问题    In 1961, scientists set up gigantic, sensitive apparatus to collect radio waves from the far reaches of space, hoping to discover in them some mathematical pattern indicating that the waves were sent out by other intelligent beings. Someday the experiment may succeed.
   What reason is there to think that we may actually detect intelligent life in outer space? To begin with, modern theories of the development of stars suggest that almost every star has some sort of family of planets. So any star like our own sun (and there are billions of such stars in the universe) is likely to have a planet situated at such a distance that it would receive about the same amount of radiation as the earth.
   Furthermore, such a planet would probably have the same general composition as our own; so, allowing a billion years or two--or three--there would be a very good chances for life to develop, if current theories of the origin of life are correct.
   But intelligent life7 Life that has reached the stage of being able to send radio waves out into space in a conscious pattern7 Our own planet may have been in existence for five billion years and may have had life on it for two billion, but it is only in the last fifty years that we are capable of sending radio waves into space. From this it might seem that even if there were no technical problems involved, the chance of receiving signals from another planet would be extremely small.
   This does not mean that intelligent life at our level does not exist somewhere. There are such an unimaginable number of stars that, even at such miserable odds, it seems certain that there are millions of intelligent life forms scattered through space. The only trouble is, none may be within our reach. Perhaps none never will be; perhaps the distances that separate us from our fellow inhabitants of this universe will forever remain too great to be conquered. And yet it is conceivable that someday we may come across one of them or one of them may come across us. What would they be like, these extraterrestrial(地球以外的) creatures?
What can be inferred from the passage?
选项 A、Sooner or later, we can find intelligent life on stars.
B、Many planets have the same condition as our earth.
C、Life depends on the stars like the Sun.
D、We will certainly receive the messages sent to us by other intelligent beings.
答案C
解析 选项A是错误的；选项B文章本身已经提到；选项C可以从文章中推断出来。选项D错误，见第四段最后一句话 From this it might seem that even if there were no technical problems involved，the chance of receiving signals from another planet would be extremely small．(从中我我们可以看到，即使不存在任何技术问题，收到来自其他星球信号的几率微乎其微)。
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