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
The temperature of the Sun is over 5 000 degrees Fahrenheit at the surface, but it rises to perhaps more than 16 million degrees
The temperature of the Sun is over 5 000 degrees Fahrenheit at the surface, but it rises to perhaps more than 16 million degrees
admin
2012-07-17
47
问题
The temperature of the Sun is over 5 000 degrees Fahrenheit at the surface, but it rises to perhaps more than 16 million degrees at the center. The Sun is so much hotter than the Earth that matter can exist only as a gas, except at the core. In the core of the Sun, the pressures are so great against the gases that, despite the high temperature, there may be a small solid core. However, no one really knows, since the center of the Sun can never be directly observed.
Solar astronomers do know that the Sun is divided into five layers or zones. Starting at the outside and going down into the Sun, the zones are the corona (日冕, 光环层),chromosphere (色球层),photosphere (光球层),convection zone(对流层),and finally the core. The first three zones are regarded as the Sun’s atmosphere. But since the Sun has no solid surface, it is hard to tell where the atmosphere ends and the main body of the Sun begins.
The Sun’s outermost layer begins about 10 000 miles above the visible surface and goes outward for millions of miles. This is the only part of the Sun that can be seen during an eclipse (日 食) such as the one in February, 1979. At any other time, the corona can be seen only when special instruments are used on cameras and telescopes to shut out the glare of the Sun’s rays.
The corona is a brilliant, pearly white, filmy light, about as bright as the full Moon. Its beautiful rays are a sensational sight during an eclipse. The corona’s rays flash out in a brilliant fan that has wispy (纤细的) spike-like rays near the Sun’s north and south poles. The corona is thickest at the Sun’s equator.
The corona rays are made up of gases streaming outward at tremendous speeds and reaching a temperature of more than two million degrees Fahrenheit. The rays of gas thin out as they reach the space around the planets. By the time the Sun’s corona rays reach the Earth, they are weak and invisible.
What is the main topic of the passage?
选项
A、The great pressures of the Sun.
B、The high temperature of the Sun.
C、The structure of the Sun.
D、How the Sun evolved.
答案
C
解析
本题问本文的主题是什么。利用浏览式阅读法通读全文内容和重点词句,我们可以推断出本文的中心思想是介绍太阳的结构。因此,本题的正确答案应是C。
转载请注明原文地址:https://kaotiyun.com/show/e6XO777K
0
在职攻硕英语联考
相关试题推荐
IntheUnitedStatesandinmanyothercountriesaroundtheworld,therearefourmainwaysforpeopletobe【C1】______aboutdeve
Peoplethinkingabouttheoriginoflanguageforthefirsttimeusuallyarriveattheconclusionthatitdevelopedgraduallyas
Thechildwassoingenuousthatevenwhensheknockedthetelevisionoffitsstandsothatitwasirreparablydamaged,herparen
ThehistoryofAfrican—Americansduringthepast400yearsistraditionallynarrated【C1】______anongoingstruggleagainst【C2】___
ThegreatAmericanscientistEdisonhadaremarkable______forinventingnewthings.
TheworkersofspaceshuttleDiscoverygotintothebackoftheshuttletolookfor______intheelectronicsthatsenddatafrom
AbudgetapprovedbytheEuropeanParliamentfortheEuropeanEconomicCommunitywasdeclaredadoptedTuesdaydespiteopposition
AbudgetapprovedbytheEuropeanParliamentfortheEuropeanEconomicCommunitywasdeclaredadoptedTuesdaydespiteopposition
AbudgetapprovedbytheEuropeanParliamentfortheEuropeanEconomicCommunitywasdeclaredadoptedTuesdaydespiteopposition
Inspiteoftheattractions,Guidehasnotadoptedthisuniformapproach,mainlybecauseunifyingratherdifferenttypesofobje
随机试题
常情况,ADP浓度是调节线粒体呼吸的主要因素.劳动或运动时ATP因消耗大而急剧减少。此时_______。
关于肾脏解剖结构的描述,错误的是
三种麻黄生物碱的含量是
李先生,45岁,以“间断巩膜黄染伴腹胀2年,加重1周”之主诉入院。患者2年前无明显诱因出现巩膜黄染,伴有腹胀,在当地医院诊断为酒精性肝硬化。1周前患者上述症状加重,胃镜检查:胃溃疡(A2期)。诊断:酒精性肝硬化;胃溃疡(A2期)。医嘱:属于人类细胞正
1989年9月,国家国有资产管理局正式颁布了(),标志着我国资产评估行业的诞生。
国家助学贷款的发放方式是()。
给定资料1.互联网的风起云涌,不仅从根本上颠覆了许多传统行业,同时也创造了新的行业和机遇。2l世纪初,有学者提出了互联网时代协同消费的理念和发展模式,并将其分为若干阶段。最初,是代码共享,即通过互联网向用户提供信息,但信息流是单向的,用户不能参与
随着互联网络的发展,网上购物同手机购物已成为快节奏的生活人群所不可缺少的一部分。电子车票主要是指通过网络获取(二维码、短信信息等)虚拟凭证,并凭此代替原本的纸质车票(汽车票、火车票等)使用登车的车票。购买“电子车票”体现了()。
Whenwesaystockholdersofafirmcanvotewiththeirfeet,wemeanstockholders______.
Splittingdinnercheckscancauseasplittingheadache,evenwhenthedinersaremathematicsmajors.Threecomputerscience【B1】_
最新回复
(
0
)