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
2023-11-19
19
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] Meteors were believed to be "falling stars" NOT in that ______.
选项
A、they themselves can send out light and heat
B、they look like stars
C、they are from out of the world
D、they are moving downward
答案
A
解析
细节理解题。对应原文第三段:Most meteors do bum up when they enter the arth’s atmosphere, with the exception of the large meteors,which are dragged through the earth’s alzaosp here by the earth’s gravitational pull.并由第二段可知其象星星一样发光和热,所以可知正确原因是B,C,D,因此答案为A。gravitational adj.(万有)引力的;重力的
转载请注明原文地址:https://tihaiku.com/zcyy/3199430.html
相关试题推荐
Oneofmedicine’sfundamentalbeliefsaboutpregnancyandthedevelopmento
Oneofmedicine’sfundamentalbeliefsaboutpregnancyandthedevelopmento
Innosmallmeasure,theepidemicofparanormalbeliefs--beliefsbeyondth
Innosmallmeasure,theepidemicofparanormalbeliefs--beliefsbeyondth
Innosmallmeasure,theepidemicofparanormalbeliefs--beliefsbeyondth
Croquetisapopularlawngame_________playershitwoodenbailsthroughwirea
Cultureisthesumtotalofallthetraditions,customs,beliefs,andways
Cultureisthesumtotalofallthetraditions,customs,beliefs,andways
Accordingtotheprofessor,whatwere,thebeliefsoftheGreekphilosophersbas
Accordingtotheprofessor,whatwere,thebeliefsoftheGreekphilosophersbas
随机试题
Allflights______becauseofthesnowstorm,wedecidedtotakethetraininstead
After______forthejob,youwillberequiredtotakealanguagetest.A、beingi
Stressmaybedefinedastheresponseofthebodytoanydemand.Wheneverpeo
Manyofthemostdamagingandlifethreateningtypesofweathertorrentialra
哪项是治疗外感风寒之眉棱骨痛首选药A.藁本 B.蔓荆子 C.辛夷 D
下列哪一项不符合多发性骨髓瘤A.高钙血症 B.高黏滞血症 C.高白蛋白血症
张某在脚手架上施工时,发现部分扣件松动而可能倒塌,所以停止了作业,这属于从业人员
临终患者感知觉改变的表现有A:大便失禁 B:视觉减退至消失 C:小便失禁
小孙下班收工关闭车床时。因与同事聊天未遵守操作规程导致手指被车床挤伤,花去医疗费
现行建筑安装工程费用组成的有关规定,施工机械使用费包括()。A.机械操作人员的
最新回复
(
0
)