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
52
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、Men on the Earth are protected by the atmosphere.
B、Radiation only have short-term effects on men on the Earth.
C、The Earth is quite far from the radiation areas.
D、The Van Allen Belts absorb all radiation.
答案
A
解析
短文中提到,Neither of these forms of radiation are danger to us on the earth,since we are protected by our atmosphere。since表原因,故答案为A)。注意解答因果关系题时要听清表示因果关系的标志,如for,since,because of,as等。
转载请注明原文地址:https://tihaiku.com/zcyy/3572529.html
相关试题推荐
[originaltext]M:You’renotstillwatchingtelevision,areyou?W:Ienjoyyour
[originaltext]M:AsfarasIknow,manystudentswhochoosetoliveoffcampus
[originaltext]M:Theelectionwillbeverycloseaccordingtothepolls.W:Rem
[originaltext]M:Theelectionwillbeverycloseaccordingtothepolls.W:Rem
[originaltext]M:Theelectionwillbeverycloseaccordingtothepolls.W:Rem
[originaltext]Manyfactssuggestthatchildrenareoverweightandthesitua
[originaltext]Manyfactssuggestthatchildrenareoverweightandthesitua
[originaltext]Manyfactssuggestthatchildrenareoverweightandthesitua
[originaltext]Inthislesson,IwanttotalkaboutthehistoryofTheWhite
[originaltext]Inthislesson,IwanttotalkaboutthehistoryofTheWhite
随机试题
Lawsshouldbeflexibleenoughtotakeaccountofvariouscircumstances,times,
Beijinghasanextensivepublictransportationnetwork.SubwayandCityRail
长江公司为上海证券交易所上市的国有控股公司,2017年发生了如下有关股权激励、
“无阳则阴无以生”所说明的阴阳关系是A.阴阳交感 B.阴阳互根 C.阴阳对立
下列各项,可引起U波增高的是()A.低血钙 B.低血钾 C.高血压
在政府的非税收入中,体现国有产权的收入是()。A.国有资源有偿使用收入 B
城市总体规划纲要的任务是()。A.提出重大基础设施和公共服务设施的发展目标
项目生命周期中,开始阶段需要完成的工作是()。A、进行项目细节设计B、制定项目
在个人住房贷款业务中,对借款申请人贷前调查的方式包括()。 A.审查借款申请材
根据《建筑工程施工许可管理办法》,申请领取施工许可证应当具备的条件不包括( )。
最新回复
(
0
)