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[originaltext] Not long ago it was assumed that the dangers man would meet in
[originaltext] Not long ago it was assumed that the dangers man would meet in
游客
2024-06-14
4
管理
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.
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. 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.
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 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、Because men on the Earth are protected by the atmosphere.
B、Because radiation only have short-term effects on men on the Earth.
C、Because the Earth is quite far from the radiation areas.
D、Because the Van Allen Belts absorb all radiation.
答案
A
解析
Why can’t people on earth be harmed by radiation?
四个选项都是以because开头,由此可以推测,本问题的考查内容是某件事情的原因。
文中提到Neither of these forms of radiation are danger to us... since we are protected by our atmosphere... Once outside the atmosphere...can be harmful in a number of ways. 地球上的人没有受到辐射伤害是因为有大气层的保护,一旦出了大气层,就会受到辐射的威胁。故正确答案为A)。
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