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
20
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.
There may be a solid core at the center of the Sun______.
选项
A、because the pressures are great
B、for the temperature is not high enough
C、in spite of the great pressures
D、because of the high temperature
答案
A
解析
本题是一道具体细节题。问在太阳的中心可能会有一个固体的核心,原因是什么。利用查阅式阅读法,我们可以在文章的第一段中找到相关信息。这部分指出,在太阳的核心,气体受到极强的压力以至于尽管温度很高,那里也可能有个小固体核心。因此,本题的正确答案应是A“因为那里的压力太大了”。
转载请注明原文地址:https://kaotiyun.com/show/n7XO777K
0
在职攻硕英语联考
相关试题推荐
Malnutritionduringweaningage—whenbreastmilkisbeingreplacedbysemi-solidfoods—ishighlyprevalentinchildrenofpoorh
Themagicianpickedoutseveralpersons______fromtheaudienceandaskedthemtohelphimwiththeperformance.
ThereislittlereasontobelievethattheUnitedStateswill______fromitsstatedgoalofregimechangeinIraq.
Theyearsbetween1870and1895broughtenormouschangestothetheaterintheUnitedStatesastheresidentcompanywasundermi
Hewasconcernedonlywithmundanematters,especiallythedailystockmarketquotations.
OurculturehascausedmostAmericanstoassumenotonlythatourlanguageisuniversalbutthatthegesturesweuseareunderst
Telecommuting—substitutingthecomputerforthetriptothejob—hasbeen______asolutiontoallkindsofproblemsrelatedtoof
Inproportionasthe_________betweenclasseswithinthenationdisappearsthehostilityofonenationtoanotherwillcometoa
Theoriginalpurposeofdevelopingartificialskins,bonesandtissuesisto______.Thesentence"...changingyourfaceorim
Justsevenyearsago,theJarvik-7artificialheartwasbeingcheeredasthemodelofhumancreativeness.ThesightofBarneyCl
随机试题
责任护士对肾病综合征患者给予的饮食指导中,不妥的是
号召德国要摆脱对法国文学的依赖,主张创作“市民悲剧”的是【】
伴有糖尿病的水肿患者,不宜选用
建筑材料的物理性质中属于与温度有关的性质有()。
.以下哪种管材不得用作屋面外排水的雨水管?
给水处理工艺中,设置消毒工序的目的是()。
下列情形中属于诉讼时效中断的事由是( )。
社会是变化发展的,德育不能仅传授给学生固定的价值观点,要教会学生如何分析不同的道德价值,这反映的德育模式是()。
求的渐近线.
微分方程y"-y=ex+x的特解形式为y*=()
最新回复
(
0
)