首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Contrary to popular belief, "falling stars" are not stars at all, but are meteors, solid bodies that travel throng space. M
Contrary to popular belief, "falling stars" are not stars at all, but are meteors, solid bodies that travel throng space. M
admin
2010-04-24
55
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.
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://kaotiyun.com/show/MU2K777K
0
专业英语四级
相关试题推荐
CampfirestwinkledonthebeachesandalongthecausewaysnearCapeKennedy.Nearlyamillionpeoplehadcometowatchthelaunc
ThespeakerstatesthattheStoneAgewassonamedbecause______.
ScientistshavelongbelievedonewaytostoptheEarth’satmospherefromwarmingisbyplantingmoretrees.Theideaisthatmo
ScientistshavelongbelievedonewaytostoptheEarth’satmospherefromwarmingisbyplantingmoretrees.Theideaisthatmo
Clothes,decorations,physique,hairandfacialfeaturesgiveagreatdealofinformationaboutus.Forinstance,wewearclothe
Beethovenestablishedhimselfasthegreatestcomposer______.
Doesusingawordprocessoraffectawriter’sstyle?Themediumusuallydoesdosomethingtothemessageafterall,evenifMars
Doesusingawordprocessoraffectawriter’sstyle?Themediumusuallydoesdosomethingtothemessageafterall,evenifMars
It’srareforaEuropeantobehonoredinthewaythatrockartexpertGeorgeChaloupkawasrecentlybyanaboriginal(土著)."He
Thewaterinthepoolisas______asamirror.
随机试题
商标在中国政府主办的或者承认的国际展览会上展出的商品上首次使用的,自该商品展出之日起()个月内,该商标的注册申请人可以享有优先权。
高血压病人的合理饮食包括哪些内容?
A谷氨酸B色氨酸C酪氨酸D半胱氨酸E鸟氨酸精脒、精胺的前体是()
患者,女,41岁。2日来右后牙夜痛不能眠,3个月来右侧下后牙咬物不适,冷水引起疼痛。近几日来,夜痛影响睡眠,并引起半侧头、面和右耳后部痛,分不清痛牙位置。检查时见右侧上、下第一、二磨牙均有邻面深龋洞。为确定患牙应进行的检查是
某药品经营企业未在规定时间内通过GSP认证,仍进行药品经营活动,根据《中华人民共和国药品管理法》以及《中华人民共和国药品管理法实沲条例》,属地药品监督管理部门对该企业的处罚是
(1)我们在对某些教育现象进行分析后,__________应该思考教育的更深层次的问题。(2)上千吨的轮船碰上这么大的风浪也得上下颠簸,__________这么一只小船。(3)他的动作完成得简直无可挑剔,__________全体裁判员无
股票市场需求的决定因素中,政策因素包括()
依据印花税的有关规定,下列说法正确的有()。
根据《公务员法》的规定,下列属于公务员行政处分的有
以下不合法的VB变量名是
最新回复
(
0
)