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
2012-01-16
68
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, chromosphere, photosphere, convection zone, 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 corona is a brilliant, pearly white, firmly 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 weak spikelike 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 speed and reaching a temperature of more than 2 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.
With what topic is the passage mainly concerned?
选项
A、How the Sun evolved.
B、The structure of the Sun.
C、The high temperature of the Sun.
D、The great pressures of the Sun.
答案
B
解析
本题为概括题。全文讲解太阳可分5层,以及各层的结构形成,因此太 阳的结构是全文的主题。因此[B]选项为正确答案:
转载请注明原文地址:https://kaotiyun.com/show/6d5d777K
本试题收录于:
公共英语二级笔试题库公共英语(PETS)分类
0
公共英语二级笔试
公共英语(PETS)
相关试题推荐
StudentswhosaytheyneverorhardlyeveruseddictionariesoftenspeakEnglishwellbutusuallywritepoorly,becausetheymak
【B1】【B9】
Pollutioninwaterisnoticed______.Thelivingthingsdiebecausethereisno______intheriverorsea.
—Haveyouseen______schoolbag?Iputitherejustnow.—Isit______redone?
请你根据下面的提纲写一篇短文,短文必须包括以下所有内容,细节可视情况自行增加,语句通顺,条理清楚,意思连贯。(1)抽烟是一种坏习惯,但许多人甚至在中学就已经染上了这个坏习惯;(2)列举抽烟的两三种害处;(3)你对禁止抽烟的看法
Whatisprobablythetimefortheappointment?
Hesayshe______thebookseveraltimesalreadythisyear.
Accordingtothepassage,alargenumberofchildrencanbesavedonlywhen______.Whichofthefollowingsituationswillcause
Whydidn’tshetellherbossaboutherappointment(约会)?
What’sthenumberofMr.Prince’stelephone?
随机试题
MichaelJackson—theUpsandDownsMichaelJackson,theseventhofninechildren,startedhismusicalcareerwithhisbrothersin
超文本中不仅含有文本信息,还包括的信息有()。
管道支架安装时应按照测绘放线的位置来进行,安装位置应准确、间距合理、()。
甲、乙双方订立协议,由甲作为名义股东,代为持有乙在丙有限责任公司股权,但投资收益由实际投资人乙拿有。协议并无其他违法情形。后甲未经乙同意,将其代持的部分股权,以合理价格转让给丙公司的股东丁。丁对甲只是名义股东的事实不知情。根据公司法律翻度的规定,下列表述中
潘婷(PANTENE)润发精华素系列平面稿口号:爱上你的秀发(Loveyourhair)标题:一见钟情正文:只要你试一次,这种滋润的感觉,你期待已久。虽然是第一次,发质会有意想不到的改善。全新潘婷润发精华素,每次洗发后使用
随着快递业的发展,一些与快递有关的“黑科技”也初露端倪。其中,分拣机器人以其呆萌的外形走红网络。下列有关分拣机器人的说法错误的是:
请举例说明教师威信对教育成效的影响。
由于常规的抗生素的使用可以产生能在抗生素环境下存活的抗生菌,人体内存在抗生菌是由于人们使用处方抗生素,但是一些科学家相信人体内大多数抗生菌是由人们吃下的已经被细菌感染的肉类而来的。以下哪项如果为真,将最显著地支持这些科学家的想法?
在VisualFoxPro中,关于查询和视图的正确描述是( )。
Butfortheseinterruptionsourmeetingwouldhavefinishedhalfanhourago.
最新回复
(
0
)