首页
登录
职称英语
Contrary to popular belief, "falling stars" are not stars at all, but are m
Contrary to popular belief, "falling stars" are not stars at all, but are m
游客
2024-10-23
44
管理
问题
Contrary to popular belief, "falling stars" are not stars at all, but are meteors, solid bodies that travel throng space.
Meteor, ranging in size from that of a pinhead, to many tons, are visible to the naked eye at night, when the friction between the surfaces of the meteors and of the air, produces heat as the meteors enter the earth’s
atmosphere. The intense heat burns up the meteors, which leave a blazing trail of light in their wake.
Most meteors do burn up when they enter the earth’s atmosphere, with the exception of the large mete- ors, which are dragged through the earth’s atmosphere by the earth’s gravitational pull. After successful landings upon the earth, these huge bodies are renamed meteorites. Some scientists theorize that thousands of meteors fall to the earth during the daytime and the nighttime, but this theory is impossible to prove or to disprove, as most would necessarily land in water, which covers most of the earth’s surface.
Generally speaking, meteors and meteor particles travel together in swarms like bees, with the exception of the loners, and travel in any direction they choose. Nature’s spectacular fireworks show, a "meteor shower", comes into view when the swarms encounter the upper layer of the earth’s atmosphere during the earth’s perpetual revolution around the sun. The friction produced when the meteors and the meteor particles rub against the atmospheric air, and they fall towards the earth in a brilliant display of light.
The source of meteors traveling through space has yet to be explained satisfactorily. For thousands of years, the common belief held, was that meteors, or "falling stars," were literally from out of this world. In 467 BC, Roman historians recorded the extraordinary fall of a meteor to the earth.
Today, astronomers support the theory that comets spawn the swarms. The comets’ offspring, the mete- or swarms, travel in regular orbits, similar to the earth’s orbit around the sun. One must be quite patient to witness such a swarm, or a meteor shower, as the swarms cross the earth’s path only once every 33 years. This spectacle of light is, however, well worth the wait. [br] Why are meteors visible to the naked eye at night?
选项
A、Because they are large stars.
B、Because most of them are burned up, giving a brilliant display of light.
C、Because they are close enough to be seen.
D、Because they like the moon can reflect the light of some stars.
答案
A
解析
细节理解题。对应原文第二段:...the friction between the surfaces of the meteors and of the air, produces heat as the meteors enter the earth’s atmosphere.The intense heat bums up the meteors, which leave a blazing trail of light in their wake.可知流星之所以可以看得到是因为和空气摩擦而燃烧的缘故。因此答案为A。 friction n.摩擦;摩擦力blazinga由.燃烧的;炽烈的waken.尾部
转载请注明原文地址:https://tihaiku.com/zcyy/3813994.html
相关试题推荐
Theplacedidnotappeartobepopular,foritwascompletelydeserted,andina
Contrarytopopularbelief,"fallingstars"arenotstarsatall,butarem
Contrarytopopularbelief,"fallingstars"arenotstarsatall,butarem
WhichofthefollowingmajorisNOTpopularinthejobmarket?[br][originalte
WhichofthefollowingmajorisNOTpopularinthejobmarket?[br][originalte
IlostmysightwhenIwasfouryearsoldbyfallingoffaboxcarinafr
IlostmysightwhenIwasfouryearsoldbyfallingoffaboxcarinafr
IlostmysightwhenIwasfouryearsoldbyfallingoffaboxcarinafr
WhoenjoysthemostpopularityinthepeopleofSouthAfrica?[br][originaltex
WhoenjoysthemostpopularityinthepeopleofSouthAfrica?[originaltext]
随机试题
Hereisaposteronamiddleschoolwebsite.Going,Going,Gone!TheHaynesMidd
Sincethedawnofhumaningenuity,peoplehavedevisedevermorecunningtoo
Accordingtothenews,thefirstquartersawa_____percentdecreaseinthecit
[originaltext]W:Haveyoufinishedreadingmyresearchreport?Iputitonyour
Ms.Breenhasbeenlivingintownforonlyoneyear,yetsheseemstobe______wi
鼻咽癌的特点是()A.早期鼻咽部就有明显肿块 B.往往早期发生淋巴转移
A.抗生素类抗肿瘤药 B.铂络合物类抗代谢药 C.氮芥类烷化剂 D.嘧啶类
当人类社会进人到信息时代,曾有人_,计算机是方块汉字的掘墓人。然而,事实_了对汉
江恩理论中,投资者可以用( )预测价格的支撑位和阻挡位。A.江恩轮中轮
按照热媒种类,水温为100℃的供热管网属于()。A.高压蒸汽热网 B.低压蒸
最新回复
(
0
)