首页
登录
职称英语
Every day of our lives we are in danger of instant death from small high-spe
Every day of our lives we are in danger of instant death from small high-spe
游客
2023-12-24
51
管理
问题
Every day of our lives we are in danger of instant death from small high-speed missiles from space—the lumps of rocky or metallic debris which continuously bombard the Earth. The chances of anyone actually being hit, however, are very low, although there are recorded instances of "stones from the sky" hurting people, and numerous accounts of damage to buildings and other objects. At night this extraterrestrial material can be seen as "fireballs" or "shooting stars", burning their way through our atmosphere. Most, on reaching our atmosphere, become completely vaporised.
The height above ground at which these objects become sufficiently heated to be visible is estimated to be about 60-100 miles. Meteorites that have fallen on buildings have sometimes ended their long lonely space voyage incongruously under beds, inside flower pots or even, in the case of one that landed on a hotel in North Wales, within a chamber pot. Before the era of space exploration it was confidently predicted that neither men nor space vehicles would survive for long outside the protective blanket of the Earth’s atmosphere. It was, thought that once in space they would be seriously damaged as a result of the incessant downpour of meteorites falling towards our planet at the rate of many millions every day. Even the first satellites showed that the danger from meteorites had been greatly overestimated by the pessimists, but although it has not happened yet, it is certain that one day a spacecraft will be badly damaged by a meteorite.
The greatest single potential danger to life on Earth undoubtedly comes from outside our planet. Collision with another astronomical body of any size or with a "black hole" could completely destroy the Earth almost instantly.
Near misses of bodies larger than or comparable in size to our own planet could be equally disastrous to mankind as they might still result in total or partial disruption. If the velocity of impact were high, collision with even quite small extraterrestrial bodies might cause catastrophic damage to the Earth’s atmosphere, oceans and outer crust and thus produce results inimical to life as we know it. The probability of collision with a large astronomical body from outside our Solar System is extremely low, possibly less than once in the lifetime of an average star. We know, however, that our galaxy contains great interstellar dust clouds and some astronomers have suggested that there might also be immense streams of meteorite matter in space that the Solar system may occasionally encounter. Even if we disregard this possibility, our own Solar system itself contains a great number of small astronomical bodies, such as the minor planets or asteroids and the comets, some with eccentric orbits that occasionally bring them close to the Earth’s path. [br] Why was it once thought that no spacecraft would survive for very long in space?
选项
A、People believed that spacecraft would be destroyed in a black hole.
B、People believed that spacecraft would be misguided by missiles.
C、People believed that spacecraft would be collided with a star.
D、People believed that spacecraft would be damaged by meteorites.
答案
D
解析
这是道细节题。从第三段的“It was thought that once in space they would be seriously damaged as a result of the incessant downpour of meteorites falling towards our planet at the rate of many millions every day.”(曾经人们认为,在太空它们会被每天以百万计不停落在地球上的陨石严重破坏。)可以看出是被陨石所破坏从而不能在地球外生存,故选D。D是指人们相信太空飞船会被陨星破坏。
转载请注明原文地址:https://tihaiku.com/zcyy/3300821.html
相关试题推荐
Thenewbornleopardhastobecomestrongenoughassoonaspossible,fordanger
Inthisnewworldthemostdangerousconflictswillnotbebetweensocialclasse
Itssuccesswasinstantaneous,thoughneitherthehostnorMr.Pepyscouldquite
Thereactionwasinstantandoverwhelming.Socialmediaexploded,radiophone-in
Thereactionwasinstantandoverwhelming.Socialmediaexploded,radiophone-in
Everydayofourlivesweareindangerofinstantdeathfromsmallhigh-spe
Researchershaveknownthatsecondhandsmokecanbejustasdangerousforno
Researchershaveknownthatsecondhandsmokecanbejustasdangerousforno
Thebiggestdangerfacingtheglobalairlineindustryisnottheeffectsoft
Thebiggestdangerfacingtheglobalairlineindustryisnottheeffectsoft
随机试题
Itiscurioushowmuchonedespisesandcondemnstheviceswhichonedoesn
BargainbookshoppersmusthavebeenpleasedlookingatAmazon’sbestseller
解痉药654-2是指()。A:天然的山莨菪碱 B:人工合成的山莨菪碱 C:
某新建二级公路为确定基层无机结合料稳定材料的最大干密度,可采用()方法。A.振
前列腺增生症患者发生急性尿潴留,首选的处理方法是A:热敷、按摩 B:留置导尿
使用钳型电流表在高压回路上测量时,应用导线从钳型电流表另接表计测量。
研究发现,大西洋、太平洋海面水温的微小变化与南美洲亚马逊热带雨林地区火灾的面积具
2020年,中国游戏市场销售收入增加,用户规模增长持续放缓,自主研发游戏收益良好
(2019年真题)甲商场进行分期付款销售,某款手机可在半年内分6期付款,每期期初
协议损害其他债权人利益的,其他债权人可以在知道或者应当知道撤销事由之日起( )
最新回复
(
0
)