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A、Radiation from the sun. B、Radiation from the Van Allen Belts. C、Radiation from the meteors. D、Radiation from the Van Allen Bel
A、Radiation from the sun. B、Radiation from the Van Allen Belts. C、Radiation from the meteors. D、Radiation from the Van Allen Bel
admin
2010-09-25
39
问题
Not long ago it was assumed that the dangers man would meet in space would be terrible, the main ones being radiation and the danger of being hit by meteors. It is perhaps worth remembering ’that less than two centuries ago the dangers of train travel seemed similarly terrible. A man would certainly die, it was thought, if carried along at a speed of thirty kilometers per hour.
(26)There are two sorts of radiation man must fear in space. The first is radiation from the sun, and this is particularly dangerous when the sun is very active and explosions are occurring on its surface. The second, less harmful form comes from the so-caned Van Allen Belts. There are two areas of radiation about 1 500 miles away from the earth. (28) Neither of these forms of radiation area danger to us on the earth, since we are protected by our atmosphere. Specifically, it is that part of our atmosphere known as the ozonosphere which protects us. This is a belt of the chemical ozone between 12 and 21 miles from the ground, which absorbs all the radiation.
(28) Once outside the atmosphere, however, man is no longer protected, and radiation can be harmful in a number of ways. A distinction must be drawn between the short-and long-term effects of radiation. The former are merely unpleasant, but just because (27) an astronaut returning from a journey in space does not seem to have been greatly harmed, we cannot assume that he is safe. The long-term effects can be extremely serious, even leading to death.
选项
A、Radiation from the sun.
B、Radiation from the Van Allen Belts.
C、Radiation from the meteors.
D、Radiation from the Van Allen Belts and from the meteors.
答案
D
解析
文中提到There are two sorts of radiation man must fear in space. The first is radiation from the sun...The second, less harmful form comes from the so-called Van Allen Belts. 在外太空,宇航员必须提防的辐射有两种。一种是太阳辐射,一种是所谓的“Van Allen Belts”辐射。故正确答案为D。
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0
大学英语六级
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