首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
A、Traffic accidents. B、Radiation. C、Train travel. D、Air crash. B原文提及“不久前人们认为在太空中会遭遇到严重的威胁,主要有辐射和流星撞击”。故B正确。
A、Traffic accidents. B、Radiation. C、Train travel. D、Air crash. B原文提及“不久前人们认为在太空中会遭遇到严重的威胁,主要有辐射和流星撞击”。故B正确。
admin
2021-09-17
130
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-called Van Allen Belts. These are two areas of radiation about 1,500 miles away from the earth. Neither of these forms of radiation is a 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.
9.What was one of the main dangers man would meet in space?
10.When is the sun radiation particularly dangerous to human beings?
11.Why did the speaker say neither of these forms of radiation is a danger to us?
选项
A、Traffic accidents.
B、Radiation.
C、Train travel.
D、Air crash.
答案
B
解析
原文提及“不久前人们认为在太空中会遭遇到严重的威胁,主要有辐射和流星撞击”。故B正确。
转载请注明原文地址:https://kaotiyun.com/show/ivD7777K
0
大学英语六级
相关试题推荐
Google’sPlanforWorld’sBiggestOnlineLibrary:PhilanthropyOrActofPiracy?A)Inrecentyears,teamsofworkersdi
SurvivalSkillsforaJobYouDetestA)Weallhaveheard—oratleastseeninthemovies—greatstoriesaboutpeoplewhoareworki
It’sHardtoCleanBigDataA)KarimKeshayjee,aTorontophysiciananddigitalhealthconsultant,crunchesmountainsofdatafro
WillAIRobotsTurnHumansintoPets?A)InaroomattheUnitedNationsoverlookingNewYork’sEastRiver,atatableaslon
A、Designingfashionitemsforseveralcompanies.B、Modelingforaworld-famousItaliancompany.C、WorkingasanemployeeforFer
孔府,旧称衍圣公府,西与孔庙毗邻,为历代衍圣公的官署和私邸,是我国现在唯一较完整的明代公爵府。孔府与孔庙、孔林合称“三孔”,是中国重点文物保护单位,1994年12月被列为世界文化遗产。由于孔子创立的儒家思想(Confucianism)对维护社会统治安定所起
传统的中国绘画是一门独特的艺术(fineart),无论是风格还是技巧都与世界其他艺术门类迥然不同。中国人绘画采用毛笔(brush)蘸墨汁或颜色,灵巧地挥洒(wield)纸上。画家用深、浅、浓、淡的点(dot)和线构成一幅图画。在优秀画家的手里,毛笔和墨汁
WillthereeverbeanotherEinstein?ThisistheundercurrentofconversationatEinsteinmemorialmeetingsthroughouttheyear.
A、Tosavemoneyonfood.B、Tobuyfoodwithoutadditives.C、Todoallhisshoppinginoneplace.D、Tomeetotherhealthconsciou
CanTonyBlairSavetheWorldofBooks?[A]AtthebeginningofAJourney,TonyBlairboaststhathehas"thesoulofarebel".
随机试题
某商品上月售价为进价的1.4倍,销售m件。本月该商品进价下降20%,售价不变,销售利润为上月的1.8倍。那么本月的销量为多少件?
Thedestructionofthesetreasureswasalossformankindthatnoamountofmoneycould______.
血管造影的并发症,哪个除外
渴喜热饮,饮水不多属于
后马托品用于丙胺太林用于
不属于陶瓷材料的特点的选项是()。
下列不属于气象、气候景观的是()。
任何测量必须具备的要素包括()。
Farfromjoiningthelabourforce,womenhavebeenfallingawayatanalarmingpace.ThefemaleemploymentrateinIndia,counti
WhenTonyBlairwaselectedtoBritain’sHouseofCommonsin1983,hewasjust30,theLabourParty’syoungestM.P.Labourhadj
最新回复
(
0
)