Question

Still waiting for little green men to make contact? Don't hold your breath.
A leading astronomer has concluded there probably aren't any aliens out there – meaning we are absolutely alone in the universe.
Even though there may be tens of thousands of other distant planets similar in size to Earth, the conditions on them are likely to be too hard to support life-forms such as ET.
Dr Howard Smith, a senior astrophysicist at Harvard University, believes there is very little hope of discovering aliens and, even if we did, it would be almost impossible to make contact.
So far astronomers have discovered a total of 500 planets in distant solar systems – known as extrasolar systems – although they believe billions of others exist.
But Dr Smith points out that many of these planets are either too close to the sun or too far away, meaning their surface temperatures are so bad that they could not support life. Others have unusual orbits which cause vast temperature variations, making it impossible for water to exist – the most important thing for life.
Dr Smith said, "We have found that most other planets and solar systems are wildly different from our own. It means it is highly unlikely there are any planets with intelligent life close enough for us to make contact." But his suggestions contradict other leading scientists who have claimed aliens almost certainly exist.
Only last month Professor Stephen Hawking said the fact that there are billions of galaxies out there made it reasonable to think there were other life-forms in the universe.
Researchers from the University of London have recently suggested that aliens could be living on as many as 40,000 other planets. But Dr Smith said: "Any hope of contact has to be limited to a relatively tiny space around the Earth, reaching maybe 1,250 light years out from our planet, where aliens might be able to pick up our signals or send us their own. But communicating would still take decades or centuries."
【小題1】By saying ＂don’t hold your breath＂, the author advised the reader not to _____.

A．keep silent

B．give up

C．expect so

D．be afraid

【小題2】Dr Smith concludes there probably aren’t any aliens because other planets _____.

A．a(chǎn)re too far away from the earth

B．a(chǎn)re different from the Earth in size

C．don’t have rich natural resources

D．don’t have a suitable living environment

【小題3】Researchers from the University of London are mentioned to show that ______.

A．they have better explanations about aliens

B．a(chǎn)liens certainly exist on many planets

C．they disagree with Dr Smith’s suggestion

D．a(chǎn)liens can pick up signals from the earth

【小題4】What’s the main idea of the text?

A．There must be other life forms in the universe.

B．We can communicate with aliens in decades.

C．The chances of finding aliens are slight.

D．Many other planets are quite different from the Earth.

Answer 1

【小題1】C
【小題2】D
【小題3】C
【小題4】C

解析試題分析：文章講述了天文學(xué)家對外星人是否存在的事實進行論述，要想找到外星人的幾率是非常小的，幾乎可以說我們是太空唯一的生物群。
【小題1】推斷題。從后文A leading astronomer has concluded there probably aren't any aliens out there – meaning we are absolutely alone in the universe.可知科學(xué)家已經(jīng)得出不可能有外星人的存在，我們是宇宙中唯一的生物，故選C
【小題2】細節(jié)題。從文章the conditions on them are likely to be too hard to support life-forms such as ET.可知，由于生存條件的惡劣，不可能有像外星人這樣的生物存在，故選D
【小題3】細節(jié)題。從文章Researchers from the University of London have recently suggested that aliens could be living on as many as 40,000 other planets.可知他們認為有外星人的存在而Dr Smith并不認為這樣，故選C
【小題4】主旨題。從全文及最后一段reaching maybe 1,250 light years out from our planet, where aliens might be able to pick up our signals or send us their own. But communicating would still take decades or centuries."可知，要想找到外星人的幾率幾乎是微乎其微，故選C
考點：科普類說明文
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