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
2014-04-23
28
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.
According to the passage, as the corona rays reach the planets, they become______.
选项
A、darker
B、weaker
C、cooler
D、clearer
答案
B
解析
本题是一道具体细节题。问按照文章内容,随着光环层光线接近行星,它们会变得怎样。文章最后一段指出,光环层的光线由高速外流气体组成,其温度可达200万华氏度以上。气浪光线在到达行星周围空间时,逐渐减弱。当太阳光环带的光线到达地球时,强度减弱,光线便看不到了。因此,本题的正确答案应是B“光线逐渐减弱”。
转载请注明原文地址:https://kaotiyun.com/show/I7XO777K
0
在职攻硕英语联考
相关试题推荐
ItisincongruousthatthenumberofBritishinstitutionsofferingMBAcoursesshouldhavegrownby254percentduringaperiod
Theearthiswitnessinganurbanrevolution,aspeopleworldwidecrowdintotownsandcities.In1800onlyfivepercentofthew
CoxRadio,oneofthenation’slargestradiochains,plansto______itstieswithindependentrecordpromoterstodistanceitself
AMonitor/TIPPpolllastmonthfoundthatyoungpeopleandseniorsheldsimilarviewswhenaskedto______theimportanceofUSm
By1830theformerSpanishandPortuguesecolonieshadbecomeindependentnations.Theroughly20million【C1】______ofthesenati
Whatwillmanbelikeinthefuture—in5,000oreven50,000yearsfromnow?Wecanonlymakeaguess,ofcourse,butwecanbes
Nowscientistscannotrealize______soonthatexistingscientificknowledgeisnotnearlysocomplete,certainandunalterablea
Hewasbroughttoconsciousnesswhenthedoctorhad_____artificialrespiration.
IcametoIndiaayearagotofindavillageinwhichIcouldliveandwritebutitwasmanymonthsbeforeIsettleddownhappil
Artificialflowersareusedforscientificaswellasfordecorativepurposes.Theyaremadefrom【C1】______ofmaterials,suchas
随机试题
患者失眠多梦,惊悸怔忡,心烦神乱,舌红,脉细数。治宜
行政机关及工作人员的职能范围、权限大小与关系都要有法律规范的明确授予与规定,这是()
若y=ksin2x的一个原函数是(2/3)cos2x,则k=
男性,50岁,饮酒后出现中上腹部程序性疼痛12h,呕吐两次。体温37.7℃,上腹部偏左压痛。如诊断轻型胰腺炎,哪一项治疗是不适当的
腺瘤的特点有
设备采购及储运费是指( )所发生的。
进度偏差对施工成本偏差分析的结果有重要影响,下列关于进度偏差说法正确的是()。
编制国际收支平衡表的基本原则是()。
某水池有浮游动物和藻类两个种群,其种群密度随时间变化的趋势如图,若向水池中投放大量专食浮游动物的某种鱼(丙),一段时期后,该水池甲、乙、丙三个种群中仅剩一个种群。下列关于该水池中上述三个种群关系及变化的叙述,正确的是()。
下边这两套图形具有某种相似性,也存在某种差异。请从所给的四个选项中,选出取代问号的一个,使得两套图表现出最大的相似性,并使得第二套图也表现出自己的特征()
最新回复
(
0
)