首页
登录
职称英语
What percentage of the world’s known petroleum reserves does Kuwait have? [origi
What percentage of the world’s known petroleum reserves does Kuwait have? [origi
游客
2023-11-22
20
管理
问题
What percentage of the world’s known petroleum reserves does Kuwait have?
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 per- haps 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 area is dangerous 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.
选项
A、13%.
B、16%.
C、14%.
D、15%.
答案
D
解析
原文已经很明确地告诉了我们答案:“ it has approximately fifteen per cent of the world’s known petroleum reserves.”。
转载请注明原文地址:https://tihaiku.com/zcyy/3208284.html
相关试题推荐
WhatisthepercentageofcollegegraduatesgettingjobsthroughuniversityCare
WhatisthepercentageofcollegegraduatesgettingjobsthroughuniversityCare
Whatpercentageoftheworld’sknownpetroleumreservesdoesKuwaithave?[origi
Whatpercentageoftheworldpopulationisilliterate?[br][originaltext]
Whatpercentageoftheworldpopulationisilliterate?[br][originaltext]
Thepercentageoftheannualdecreaseininfantmortalityratesince1990is___
Asamatteroffact,SaudiArabia’soilreserves_________thoseofKuwait.A、com
Whatpercentageoftheworld’sknownpetroleumreservesdoesKuwaithave?[origi
WhatisthepercentageoftotaldeclineinvehiclesalesinAprilthisyear?[br
WhatisthepercentageoftotaldeclineinvehiclesalesinAprilthisyear?[or
随机试题
[originaltext]M:Hello.W:HelloRoger?ThisisAnn.M:Ohhi,Ann.Howhaveyo
[originaltext]W:IthoughttherewasstilltimeformetocatchthetraintoNe
Theriskofdepressionforpeoplewholivealoneisalmost80percenthigher
Ithinkyouarepullingmyleg.A、我想你是在和我开玩笑吧。B、我想你是在拉我的腿。C、我想你是在拖我的腿。D、我想你是在拖
【B1】[br]【B8】A、crashB、clashC、conflictD、riotA动词词义辨析。原文的意思是“使系统受到打击并瘫痪”,只有A能表
请你谈谈对“课程内容的选择要贴近学生的实际,有利于学生体验与理解、思考与探索”的
脘腹胀痛,嗳腐吞酸,恶食呕恶,痛而欲泻,泻后痛减,或大便秘结,宜用A.枳实导滞丸
难溶性药物溶液中加入表面活性剂,使药物溶解度增加的现象是A:增溶 B:乳化
BSP客票是()客票。A.定期 B.不定期 C.中性 D.航空公司
A.七十味珍珠丸 B.二十五松石丸 C.十味黑冰片丸 D.仁清芒觉 E.
最新回复
(
0
)