英语四级完型填空练习题（3）---考怡网

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英语四级完型填空练习题（3）

www.kaoease.com 2007-10-13 考怡网阅读次

英语四级完型填空练习题（3）
　　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] common [C] 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 with [C] come up with [D] catch up with
20. [A] from [B] than [C] as　 [D] away

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