2．For more than twenty years scientists have been searching for signs of life on other planets．Most of these searches have been done over the radio．The hope is that someone in outer space may be trying to get in touch with us．Scientists also have sent radio and television messages on spaceships traveling through space，on the chance that someone may be receptive （善于接受的） to such messages．
Scientists are using powerful radio telescope to listen to signals from about 1，000stars，all within 100light years of earth．In addition，they will scan （掃視） the entire sky to"listen"for radio messages from more distant stars．Using a computer，they will be able to monitor more than eight channels at one time．Scientists are looking for any signal that stands out from the background noise．
Of the 200billion stars in the Milky Way galaxy （銀河星系），scientists find that five percent are like our sun．Perhaps half of them have a planet like earth．Such a planet would be a reasonable distance from the star for temperatures to be right for the evolution of life．Based on the inhabitable （that can be lived in） planets in our galaxy，most scientists agree that chances are likely that one or more of these planets support some life．
However，many scientists wonder whether intelligent （有智力的） life exists on other planets．Some believe that twenty years of searching without any intelligible （可理解的） messages shows that no one is out there．They say that the evolution of intelligence comparable to ours is unlikely．
Other scientists believe that our search hasn't been long enough to rule out the possibility that intelligent life exists in our galaxy．Although our sun family in only about five billion years old，our galaxy is about 20billions years old．In that time，some scientists think it is likely that civilizations are much more advanced than ours．Perhaps these civilizations send us no signals； perhaps we have not recognized the signals they have sent us．If we hope to find intelligent life，these scientists believe that we have to keep looking．

4．According to the passage，how many planets in our galaxy might human beings live？A．
A.5billion
B.10billion
C.15billion
D.200billion
5．The first paragraph in this passage is mainly aboutC．
A．where scientists are looking for signs of life on other planets
B．why scientists are looking for signs of life on other planets
C．how scientists are looking for signs of life on other planets
D．when scientists are looking for signs of life on other planets
6．The underlined word"monitor"in the passage means"B"．
A．find
B．follow
C．study
D．form
7．Which of the statements is TRUE based on the information in the passage？D．
A．The earth is one of the oldest planets in our galaxy．
B．Most scientists believe that there is intelligent life on other planet．
C．Scientists don't believe that there might be life on other planets．
D．Scientists are trying different ways to find signs of life on other planet．

分析 本文討論了人們對于外太空是否存在生命，至今為止，科學(xué)家們嘗試了多種方法尋找外星生命，但都沒有得到回應(yīng)．也有科學(xué)家認為外太空不太可能存在生命．

解答 4．A 推理判斷題．根據(jù)第三段前兩句 Of the 200 billion stars in the Milky Way galaxy，scientists find that five percent are like our sun．Perhaps half of them have a planet like earth．可知在銀河系里有200billion顆恒星，其中百分之五的恒星有一顆像地球這樣的行星．那么也就是10billion顆諸如地球的行星．故A正確．5．C 段落大意題．根據(jù)本段第二句Most of these searches have been done over the radio．和最后一句Scientists also have sent radio and television messages on spaceships traveling through space，on the chance that someone may be receptive to such messages．可知本段主要介紹的科學(xué)家們通過向太空發(fā)送無線電信號的方式來尋找外星生命．故C項正確．
6．B 詞義猜測題．根據(jù)本句Using a computer，they will be able to monitor more than eight channels at one time．科學(xué)家們向太空發(fā)射無線電信號以后，使用計算機對這些信號進行監(jiān)控，希望能夠捕捉到外星生命的痕跡．所以該詞意為"check"，故B項正確．
7．D 細節(jié)理解題．根據(jù)文章第一段Most of these searches have been done over the radio．Scientists also have sent radio and television messages on spaceships traveling through space，on the chance that someone may be receptive to such messages．可知科學(xué)家正在使用多種方法研究外星生命的存在．故D項正確．

點評 本文是一篇科教類閱讀，題目涉及多道細節(jié)理解題，推理判斷題，詞義猜測題．做題時學(xué)生應(yīng)仔細閱讀原文，把握文章主要內(nèi)容，聯(lián)系文章上下文內(nèi)容并結(jié)合所給選項含義，從中選出正確答案，一定要做到有理有據(jù)，切忌胡亂猜測．

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