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
2023-08-25
15
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/2956264.html
相关试题推荐
[originaltext]Inthepastindustrieshadmorefreedomthantheyhavenow,a
[originaltext]AnewenemyisthreateningJapanesetraditions:leisure.Asp
[originaltext]AnewenemyisthreateningJapanesetraditions:leisure.Asp
[originaltext]LastsummerIwentthroughatrainingprogramandbecameali
[originaltext]LastsummerIwentthroughatrainingprogramandbecameali
[originaltext]W:Interestedinthisbook?Thisisourbestsellerthisweek.M:
[originaltext]W:Interestedinthisbook?Thisisourbestsellerthisweek.M:
[originaltext]W:Doyouthinkyoucangiveanexactdefinitionof"management",
[originaltext]M:DoyourememberthefilmonspaceexplorationthatwasonTVl
[originaltext]M:DoyourememberthefilmonspaceexplorationthatwasonTVl
随机试题
Traditionally,theBritishRoyalFamilydoesnotget【B1】______inpolitics.I
[originaltext]Hiddenpassengerstravelinginships,trains,orevencarsca
[originaltext]Manycollegestudentshavegivenuptakingclassnotesbyhand.
在一些人甚至包括教育界内部的一部分人的心目中,对于历史学科的价值与功能的认识上,
在《上海证券交易所融资融券交易实施细则》中,上海证券交易所对于可用于融资融券的标
在九宫格内依次填入数字1~9,现从中任取两个数,要求取出的两个数既不在同一行也不
医疗机构的负责人收受药品经营企业代理人的财物,但是不构成犯罪的,对该负责人A.由
(2012年真题)李某与用人单位发生争议,在人民调解委员会主持下达成了调解协议,
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
在建设工程监理招标中,选择工程监理单位应遵循的最重要的原则是()。A.报价优先
最新回复
(
0
)