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
0
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] Which of the following statements is true?
选项
A、Until now, there have been no satisfactory and convincing findings as to the source of meteors.
B、Many astronomers believe meteors move in regular orbits around the sun.
C、It is proved that thousands of meteors travel to the earth every year, but we can only see such a show every 33 years.
D、A meteor shower was recorded by historians more than 2,500 years ago.
答案
A
解析
细节理解题。对应原文第五段:The source of meteors traveling through space has yet to be explained satisfactorily,答案为A。source n.根源;来源
转载请注明原文地址:https://tihaiku.com/zcyy/3813996.html
相关试题推荐
Beeristhemostpopulardrinkamongmaledrinkers______overallconsumptionis
Contrarytopopularbelief,"fallingstars"arenotstarsatall,butarem
WhichofthefollowingmajorisNOTpopularinthejobmarket?[br][originalte
WhichofthefollowingmajorisNOTpopularinthejobmarket?[originaltext]W:
IlostmysightwhenIwasfouryearsoldbyfallingoffaboxcarinafr
IlostmysightwhenIwasfouryearsoldbyfallingoffaboxcarinafr
IlostmysightwhenIwasfouryearsoldbyfallingoffaboxcarinafr
WhoenjoysthemostpopularityinthepeopleofSouthAfrica?[br][originaltex
WhoenjoysthemostpopularityinthepeopleofSouthAfrica?[originaltext]
Traditionalsuperstitionsandbeliefs【C1】______disappearaltogether;they
随机试题
SpaceobservationEarlydaysFirsttelescope-startedthe【
Thisfirmhasfoundthatthenumberofstaff_____isneededforqualitycontrol
Thecommandersaidthatthearmywould________withtheceasefire.A、coincideB、co
TheOlympicGamesareheldeveryfouryears,eachtimeinadifferentcity.
汽车的基本组成
某患者在胃大部分切除后出现巨幼红细胞性贫血的原因是对哪项物质吸收障碍A.蛋白质
酮体不能在肝中氧化的主要原因是肝中缺乏A、HMG辅酶A合成酶 B、HMG辅酶A
某公司用实验组事前事后对比实验来测试该公司生产的化妆品改用新包装后的效果,使用原
甲公司拟投资一个项目,需要一次性投入100万元,全部是固定资产投资,没有投资期,
环境影响经济评价的方法中,用于评估森林公园、风景名胜区、旅游胜地的环境价值的常用
最新回复
(
0
)