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However,many scientists wonder whether intelligent life exists on other planets.Some believe that twentyyears of searching without any intelligible()messages shows that no one is out there.They say that theevolution 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 lifeexists in our galaxy.Although our sun family is only about five billion years old,our galaxy is about 20 billionyears old.In that time,some scientists think it is likely that civilizations much more advanced than ours havedeveloped.Perhaps these civilizations send us no signals;perhaps we have not recognized the signals they havesent us.If we hope to find intelligent life,these scientists believe that we have to keep looking.8.How many planets in our galaxy might be inhabitable?A.15 billion.B.10 billion.C.5 billion.D.200 billion.9.What is paragraph 1 mainly about?A.Why scientists are looking for signs of life on other planets.B.How scientists are looking for signs of life on other planets.C.Where scientists are looking for signs of life on other planets.D.When scientists are looking for signs of life on other planets.10.What does the underlined word "monitor"in paragraph 2 mean?A.Find.B.Follow.C.Form.D.Check.11.What can we learn from the text?A.Scientists are trying different ways to find signs of life on other planets.B.Most scientists believe that there is intelligent life on other planets.C.The earth is one of the oldest planets in our galaxy.D.Scientists don't believe that there might be life on other planets.【语篇导读】本文是一篇议论文。文章讨论了在外太空中是否存在生命。迄今为止，科学家们尝试了多种方法寻找外太空生命，但都没有得到回应。8.C细节理解题。根据文章第三段中的Of the200 billion stars in the Milky Way galaxy,scientists find that fivepercent are like our sun.Perhaps half of them have a planet like the earth.可知，在银河系中有两千亿颗恒星，其中5%的恒星像我们的太阳，也就是100亿颗恒星像我们的太阳，而在这100亿颗恒星中有一半有像地球一样的行星，即有50亿颗行星适合居住。9.B段落大意题。根据第一段中的Most of these searches have been done over the radio.和Scientists also havesent radio and television messages on spaceships travelling through space,on the chance that someone mayanswer such messages..可知，本段主要介绍了科学家们寻找外太空生命的方式。l0.D词义猜测题。根据第二段中的Using a computer,they will be able to monitor more than eight channels atone time..可知，科学家们使用计算机对外太空的信号进行监测，希望能够捕捉到外太空生命的痕迹。故画线词与check意思相近。11.A推理判断题。根据文章第一段及后文内容可知，科学家们正在使用各种方法探究外太空生命是否存在。DBig plumes()of white steam in the nuclear and fossil fuel are a common sight around power plants,butwhile it's somewhat a relief to know it's not carbon dioxide or,worse,greenhouse gases,they do represent howmuch water is being consumed for cooling.In recent years,MIT engineers have developed a system that canharvest that water vapor()and collect it as very pure water.That can then be recycled back into a plant'sother systems that require water,such as cooling or boiling.Previous technologies designed to squeeze water out of fog or vapor usually rely on materials with highsurface areas that water drops can cling to.The MIT tech does this too,but takes a more active role.First thedrops are hit with an ion()beam to give them an electrical charge,then they pass through wire nets thathave the opposite charge.That means the water drops are strongly attracted to the net,where they gather and fallinto a plate below for collection.After a series of lab tests showed that the concept worked,the team tested the system in two of MIT's·83·