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
13
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://www.tihaiku.com/zcyy/2956265.html
相关试题推荐
[originaltext]Traditionally,itwastheparentsofthebridewhoworriedab
[originaltext]Anystudentofbodylanguageknowsthatthereisoneuniversa
[originaltext]Anystudentofbodylanguageknowsthatthereisoneuniversa
[originaltext]ThelandmarkclocktowercontainingElizabethToweratBritai
[originaltext]ThelandmarkclocktowercontainingElizabethToweratBritai
[originaltext]M:Communityserviceisanecessarysectionofeducationhereat
[originaltext]M:Communityserviceisanecessarysectionofeducationhereat
[originaltext]M:Mybrothere-mailedaboutanemergencysituation.Heneeds$3
[originaltext]M:MissGreen,ItoldDr.SmiththatIwouldcallhiminthePari
[originaltext]M:MissGreen,ItoldDr.SmiththatIwouldcallhiminthePari
随机试题
Whatthepassagetellsuscanbesummarizedbythestatementthat______.[br]T
LanceArmstrongisthirty-threeyearsoldandisoneofthebestathletesin
Asurewaytogrowyourbusinessistogetpeopleexcitedaboutyourproducts
2010年,某省广电实际总收入为145.83亿元,同比增长32.07%。其中,广
以下室内人工光源中,显色指数最低的是:()A.高压钠灯 B.白炽灯 C.
L型菌在L型琼脂平板上典型菌落为A.颗粒型菌落 B.丝状菌落 C.带状菌落
体育教学研究工作的首要环节是( )。A.提出假设 B.科研设计 C.制定计
李女士,23岁,刚毕业到一家外企工作,因担心得不到上司认可,每天工作都小心翼翼,
关于价值链分析在企业规划中应用的说法,正确的是( )。A.价值链分析不利于提高作
承包人提交的已完工程进度款支付申请中,应计入本周期完成合同价款中的有()。A.本
最新回复
(
0
)