2011 英语四级完形填空专练及答案解析(
  17) 英语四级完形填空专练及答案解析( )
来源:天星 更新日期:2011-04-27 点击: 4
Space is a dangerous place, not only because of meteors(流星) but also because of rays from the sun and other stars.The atmosphere again acts 1 our protective blanket on 2 .Light gets through, and this is essential 3 plants to make the food which we 4 .Heat, 5 , makes our environments tolerable and some ultraviolet rays(紫 外线的) penetrate the 6 .Cosmic(宇宙的) rays of various kinds come 7 the air from outer space, but 8 quantities of radiation from the sun are screened off. 9 men leave the atmosphere they are 10 to this radiation; 11 their spacesuits or the walls of their spacecraft, if they are inside, 12 prevent a lot of radiation damage.Radiation is the greatest known danger to explorers in 13 .Doses of radiation are measured in 14 called“rems(雷目)”.We all 15 radiation here on earth from the sun, from cosmic rays and from radioactive minerals.The“16”dose of radiation that we receive each year is about two millirems; it 17 according toswheresyou live, and this is a very rough estimate.Scientists have reason to think 18 a man can 19 far more radiation 20 without being damaged; the figure of 60 rems has been agreed.
  1.A.for B.with C.on D.as
  2.A.stars B.sun C.earth D.space
  3.A.with B.from C.under D.for
  4.A.use B.live C.eat D.get
  5.A.again B.also C.besides D.too
  6.A.environment B.space C.atmosphere D.earth
  7.A.across B.to C.from D.through
  8.A.valid B.enormous C.various D.proper
  9.A.As soon as B.As well as C.As much as D.As possible as
  10.A.shown B.exposed C.faced D.covered
  11.A.but B.because C.so D.so that

  12.A.get B.make C.have D.do
  13.A.earth B.atmosphere C.space D.environment
  14.A.pieces B.units C.parts D.elements
  15.A.receive B.accept C.bring D.catch
  16.A.conventional B.commonC.general D.normal
  17.A.shifts B.converts C.modifies D.varies
  18.A.what B.which C.that D.why
  19.A.put up with B.keep up withC.come up with D.catch up with
  20.A.from B.than C.as D.away Cloze Test 24
  1.【答案】D 【解析】act as“充当、起……作用”;act for“代表、代理”;act on“按照”。本句意为大气 层起到保护伞的作用。
  2.【答案】C 【解析】见上题分析。
  3.【答案】D 【解析】be essential for“对……来说是首要的、基础的”,固定搭配。
  4.【答案】C 【解析】只有 eat 与先行词 food 和定语从句 which we…搭配。
  5.【答案】D 【解析】 本句意为: 热不仅使我们的生产环境温度适宜, 而且紫外线也能穿透大气。 also 一般紧跟动词;besides 一般用在句前;too 可用在句中,用逗号隔开。

  6.【答案】C 【解析】根据上题所讲,penetrate 这个动词后面应接 atmosphere“大气”这个名词。
  7.【答案】D 【解析】这里的 come through 相当于 penetrate,穿透。come across“偶遇”;come to“来 到”; come from“来自”。 本句意为: 各类来自外部空间的宇宙射线穿透大气层……, 故选 come through。
  8.【答案】B 【解析】 Valid 有效的; various 各种各样的; proper 合适的。 在四个选项中只有 enormous 表示“大量的”意思。
  9.【答案】A 【解析】 soon as“只要”; well as“除……之外”; much as“和……一样多”; possible as as as as as“尽可能的”。
  10.【答案】B 【解析】be exposed to“暴露于”,show“展示”;face“面对”。
  11.【答案】A 【解析】本句前半句的意思是:“人们一离开大气层就会接触射线”;后半句意思是:“他 们的太空服和太空船会阻止射线造成的损害”。前后应该是转折关系,故用 but。
  12.【答案】D 【解析】Do +动词原型的结构表示强调谓语动词。
  13.【答案】C 【解析】由 radiation 和 explorers 可推测,应选 space(太空)。本句意为射线是探险者在 太空遇见的已知的最大危险。
【解析】unit“单位、单元”;element“元素”;part“部分”;piece“碎片”本句意为:射线的 多少可以以雷目这个测量单位测量。
  15.【答案】A 【解析】receive 表示客观收到;accept 表示主观接受。我们受到的辐射并非主观接受。
  16.【答案】D 【解析】conventional“传统的”;common“共同的、普通的”;general“一般的、总体的”; normal“正常的”。本句意为:我们每年接受的正常辐射量……,故选 normal。
  17.【答案】D 【解析】shift“移动”;convert“转换”;modify“修改”;vary“变化”。根据句意,所处地点 不同,所受辐射量也不一样……,故选 varies.
  18.【答案】C 【解析】本句应填入引导宾语从句的代词,而从句不缺少主语和宾语, 因而不选择 what 和 which,又加之主句是陈述语气,故选择 that。
  19.【答案】A 【解析】 up with“忍受”, put 固定搭配。 keep up with 和 catch up with 意为跟上,come up with 意为提出。
  20.【答案】B 【解析】more (radiation)后应加 than。



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