题目内容
For many years,people have wondered whether we are the only living things in the universe. Some scientists believe that there must be 1on other planets because the universe is so big. 2.other scientists don' t think so,because plants 3 a very specific environment for life to 4. There are facts that 5 both sides of the argument.
On the one hand,the universe is 6 . There are billions of stars and thousands of solar systems (太阳系) .Many of these solar systems have pjanets that go round and round a sun like Earth
7 there are so many pl^iets in space,it is 8 that one of these planets could have theright conditions needed for life. Recently,experts found 54 planets similar to Earth. They 9 that one of these planets has the 10 atmosphere (大气层) and temperature needed for life. 11 in our solar system,scientists have found 12 of water on Mars. They believe that this could 13 that there is,or was,a form of very simple life on these planets.
On the other hand,a planet needs very special 14 to have life. A planet would need to have water,the right temperature and the right mix of (化学物质) in the atmosphere.
In addition, 15 scientists believe that life might exist on other planets,we have never found evidence to 16 it. A recent report 17 that it is very unlikely that there is life on other planets. They believe we don't have enough evidence to 18 whether there is life on other planets.
in conclusion(综上所迷) ，i do not 19 that there is life on other planets. I do not think that any other planets could have 20 the same conditions as Earth. Therefore,I do not think that there could be life on other planets.
1. A. wonder B. life C. water D. air
2. A. . Besides B. So C. However D. Then
3. A. need B. provide
C. create D. protect
4. A. continue B. spare C. start D. save
5. A. cause B. develop
C. win D. support
6. A. beautiful B. huge C. dark D. open
7. A. Because B. If C. When D. While
8. A. strange B. likely C. important D. hard
9. A. realize B. hear
C. believe D. remember
10. A. right B. wet C. clear D. heavy
11. A. Just B. Soon C. Yet D. Even
12. A. pictures B. bottles
C. evidence D. plenty
13. A. find B. mean C. answer D. add
14. A. places B. chances
C. attentions D. conditions
15. A. although B. unless
C. as D. until
16. A. improve B. study
C. collect D. prove
17. A. doubts B. suggests
C. changes D. expects
18. A. ask B. guess
C. decide D. discover
19. A. agree B. know C. imagine D. forget
20. A. always B. only C. simply D.exactly
1. B. 根据上一句中的Whetherwea the only living things in 以及下文关于其他星球上是否有生命存在的正反两方的观点可知，有些科学家相信其他星球上有“生命（life) ”存在.
2. C. 根据该空后的 other scientists don't think so 可知，“然而(However) 其他科学家持不同观点。
3 A 4 C. 一些科学家认为其他星球上没有生命存在是因为星球“需要(need) ”适合生命“开始(start) 的特殊环境。
5. D。根据接下来两段具体介绍两种不同的观点可知，争论双方有各自的依据来“支持(support) ”其观点。
6. B. 根据下一句 There are billions stars and thousands of solar systems
知，宇宙“浩瀚无边(huge).”
7. A. 8. B. 根据上文中的Many of these solar systems have planets和下文
中的 one of these planets could hag the right conditions needed for life
知,“因为(Because) ”宇宙中有如此多的星球，因此“可能(likely）”有一颗星球上有适和生命存在的环境。
9.C 10.A该段主要介绍赞成其他星球上有生命存在的观点，因此专家“相信aeliever”新发现的星球上有“适宜 (right) ”生命南大气层和温度。
11 D 上文中的 thousands of solar sterns和该空后的our solar system进行比较，表示“甚至(Even) ”在我们自己的太阳系里。
12. C.根据下一句中的there 1S,01Tas,a form of very simple life i
planets可知，科学家在火星上找到水的“证据(evidence) ”。
13.B上一句中的 water on Mars 意味着（mean） 星球上有生命存在或存在过。
14. D.根据下一句中的need to water,the right temperature and the right mix of chemicals m the alLphere 可知，一颗星球需要特殊的“环境Conditions) ”来适合生命存在。
15. A 根据后半句中的 we have neve found evidence 可知“科学家相信其他星球上可能有生命”表示让步，故填（although）
16 D 我们还没有找到证据 “证明(prove) ”其他星球上确实有生命存在。
17.B 根据下一句中的They believe we don't have enough evidence可知这
份报告“间接表明(suggfts) 其他星 上不太可能有生命存在。
18. C.根据上一句中的it is very unlikely that there is life on other
planet可知，我们没有足够的证据来对其他星球上的生命存在之说“作出判断(decide) ”。
19. A.根据最后一句 Therefore,I do not think that there could be life on other planets 可知，作者不”认同（agree）“其他星球上有生命这一说法。
20.D 作者认为其他星球不可能有着和地球”完全（exactly）“一样的环境。
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