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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 1D our protective blanket on 2C . Light gets through, and this is essential 3D plants to make the food which we 4C . Heat, 5D , makes our environments tolerable and some ultraviolet rays(紫外线的) penetrate the 6C . Cosmic (宇宙的) rays of various kinds come 7D the air from outer space, but 8B quantities of radiation from the sun are screened off. 9A men leave the atmosphere they are 10B to this radiation; 11A their spacesuits or the walls of their spacecraft, if they are inside, 12D prevent a lot of radiation damage. Radiation is the greatest known danger to explorers in 13C . Doses of radiation are measured in 14B called “rem(雷姆)”。 We all 15A radiation here on earth from the sun, from cosmic rays and from radioactive minerals. The “ 16D ” dose of radiation that we receive each year is about two milligrams; it 17D according to where you live, and this is a very rough estimate. Scientists have reason to think 18C a man can 19A far more radiation 20B without being damaged; the figure of 60 rems has been agreed.
太空是一个危险的地方,不仅因为那儿有流星,而且还有来自太阳和其它行星的射线。大气层又一次充当了地球的保护层。从大气层透进来的光线是地球植物所必需的,而这些植物则给我们提供了食物。同时,光线带来的热量使得我们的环境舒适,还有一些紫外线也穿透大气层到达地球。宇宙中各种各样的射线通过大气层到达地球,然而,来自太阳的强烈辐射则被阻挡在外。一旦人类没有大气层的保护,就会受到这种辐射。但是人们穿上航天服或者呆在宇宙飞船里,则可以免受很多辐射的侵害。辐射是目前为止人类所知对太空探索者最大的威胁。放射线用“雷姆”作为衡量单位。地球上的所有辐射来自太阳、宇宙射线和放射性矿物质。我们每年所能承受的“正常辐射值”大约为200毫克,这只是一个大概的估计,因为这个值会随着我们居住的环境而改变。科学家们认为,一个人能抵挡更多的辐射而不会受到任何伤寒,这个辐射值为60雷姆。
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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