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
When we accept the evidence of our unaided eyes and describe the Sun as a yellow star, we have summed up the most important sing
When we accept the evidence of our unaided eyes and describe the Sun as a yellow star, we have summed up the most important sing
admin
2014-08-25
56
问题
When we accept the evidence of our unaided eyes and describe the Sun as a yellow star, we have summed up the most important single fact about it—at this moment in time. It appears probable, however, that sunlight will be the color we know for only a negligibly (微不足道的) small part of the Sun’s history.
Stars, like individuals, age and change. As we look out into space, we see around us stars at all stages of evolution. There are faint blooded dwarfs so cool that their surface temperature is a mere 4, 000 degrees Fahrenheit; there are scaring ghosts blazing at 100, 000 degrees Fahrenheit and almost too hot to be seen, for the great part of their radiation is in the invisible ultraviolet range. Obviously, the "daylight" produced by any star depends on its temperature; today (and for ages to come) our Sun is at about 10, 000 degrees Fahrenheit, and this means that most of the Sun’s light is concentrated in the yellow band of the spectrum, falling slowly in intensity toward both the longer and shorter light waves.
That yellow "hump" will shift as the Sun evolves. and the light of the day will change accordingly. (80)
It is natural to assume that as the Sun grows older, and uses up its hydrogen fuel—which it is now doing at the spanking rate of half a billion tons a second—it will become steadily colder and redder.
What is the passage mainly about?
选项
A、Faint dwarf stars.
B、The evolution cycle of the Sun.
C、The Sun’s fuel problem.
D、The dangers of invisible radiation.
答案
B
解析
本题为主旨题。本文主要是谈太阳的演化周期,所以为B。对A项为微红的矮星、C项为太阳的燃料问题,都只是一带而过.不可作为本文的中心议题。本文没有谈及D项的不可见辐射的危险。
转载请注明原文地址:https://www.kaotiyun.com/show/ukxO777K
0
成人本科学位英语
相关试题推荐
Theirmiddaymealis"lunch"andtheyhavearatherformaleveningmealcalled"dinner",whereastheworkingman’sdinner,ifhi
Thepassageismainlyconcernedwith______.A"pokerface"(Line3,Para.2)referstoafacewhichis______.
Accordingtothepassage,Americansexpectspeakersandwritersto______.Whichofthefollowingpeopleswilltellastoryto
Averageincomewasconsiderablyhigheramongthegiftedpeople,especiallythemen,thanforthecountryasawhole,despitethe
我们一得出结论就通知你。
Thisismuch______totheoneIboughtlastweek.
Almosteveryfamilybuysatleastonecopyofanewspapereveryday.Somepeoplesubscribe(订阅)toasmanyastwoorthreenewsp
Jennydidn’thavetimetogotoconcertlastnightbecauseshewasbusy______forherexamination.
Hewasaqualifieddoctorwhorarelypracticedbutinsteaddevotedhislifetowriting.Heoncesaid:"Medicineismylawfulwif
Hewasaqualifieddoctorwhorarelypracticedbutinsteaddevotedhislifetowriting.Heoncesaid:"Medicineismylawfulwif
随机试题
控制的范围、程度和频度应该恰到好处,防止控制过多或控制不足,这反映了控制的哪项原则()
在荧光定量分析法中,下列哪种不是影响荧光强度的因素
下列招标投标制度的基本原则中,体现公正原则的有()。
从事生产经营的纳税人不得转借、转让发票;但根据需要可以代开。 ( )
金融机构与客户建立人身保险、信托等业务关系,合同的受益人不是客户本人的,金融机构不需要对受益人的身份证件或者其他身份证明文件进行核对并登记。()
个人在金融机构开立个人存款账户时,应当出示()。
下列关于关系营销的表述,错误的是()。
卢梭说:“人生而自由,却无往不在枷锁之中。”从政治自由的角度理解正确的是()。
材料:影视产品挤压纸媒读物是当下一个明显趋势,正推动文化生态的剧烈演变。前者传播快、受众广、声色并茂,具有文字所缺乏的诸多优越,不能不使写作者们疑惑:文学是否已成为夕阳?没错,如果文字只是用来记录实情、实景、实物、实事,这样的文学确实已
2011年,某市工业企业(规模以上,下同)用水总量193.27亿立方米,比上年减少1.66亿立方米。其中,取水总量41.26亿立方米,增加0.57亿立方米;河湖海冷却水86.25亿立方米,增加1.09亿立方米。下列说法正确的有几个?①201
最新回复
(
0
)