首页
登录
职称英语
[originaltext] Not long ago it was assumed that the dangers man would meet i
[originaltext] Not long ago it was assumed that the dangers man would meet i
游客
2024-04-26
37
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 kilometres 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-called Van Allen Belts. There are two areas of radiation about 1,500 miles away from the earth. Neither of these forms of radiation are 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 armful 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.
Questions 23 to 25 are based on the passage you have just heard.
23. What forms of radiation are feared by astronauts?
24. What can we infer from the passage?
25. Why can’ t people on earth be harmed by radiation?
选项
A、Any astronaut returning from the universe is safe.
B、Any astronaut returning from the universe suffers a lot.
C、We can assume an astronaut is safe though he seems ill.
D、We cannot assume an astronaut is safe though he looks well.
答案
D
解析
选项A)和B)中的Any表述过于绝对,可初步排除。短文中提到,anastronaut returning from a journey in space does not seem to have been greatly harmed,wecannot assume that he is safe,D)中的he looks well对应该句中的does not seem to havebeen greatly harmed,故答案为D)。
转载请注明原文地址:https://tihaiku.com/zcyy/3572528.html
相关试题推荐
[originaltext]MyfatherdiedwhenIwasninemonthsold,makingmymumasi
[originaltext]Campmemorieslastforever!Wemakesuretheyareunforgettab
[originaltext]M:You’renotstillwatchingtelevision,areyou?W:Ienjoyyour
[originaltext]M:You’renotstillwatchingtelevision,areyou?W:Ienjoyyour
[originaltext]M:You’renotstillwatchingtelevision,areyou?W:Ienjoyyour
[originaltext]M:AsfarasIknow,manystudentswhochoosetoliveoffcampus
[originaltext]M:AsfarasIknow,manystudentswhochoosetoliveoffcampus
[originaltext]M:AsfarasIknow,manystudentswhochoosetoliveoffcampus
[originaltext]M:Theelectionwillbeverycloseaccordingtothepolls.W:Rem
[originaltext]M:Theelectionwillbeverycloseaccordingtothepolls.W:Rem
随机试题
Despitewhatyoumightthinkfromitsname,theMuseumofAfghanCivilizatio
PleaseUsecoolwatertowashthissweater,otherwise,itwill______.A、condense
China’sNewMiddleClassXiaJiapingopenedhisliv
依据《条例》规定,旅行社将旅游业务委托给不具有相应资质的旅行社,应当()。A.由
女性,43岁,左下肢乏力,右下肢麻木1年,查体,双侧胸8以下痛温觉减退,左下肢肌
Thechangeinthatvillagewasmiraculou
早产儿,2天,有窒息史。目前患儿嗜睡。体查:患儿瞳孔缩小,对光反应迟钝,前囟张力
窦性心动过缓的常见病因是A.发热 B.应用肾上腺素药物时 C.剧烈运动时
患儿女,10个月,足月产。反复腹泻1个月余。每天5~6次。时稀时稠。生后混合喂养
商业银行市场风险内部模型的主要优点包括()。A:可以将不同业务、不同类别的市场风
最新回复
(
0
)