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
A、Most of it is lost in the upper and lower atmosphere. B、Most of it is reflected by the gases in the upper atmosphere. C、Most o
A、Most of it is lost in the upper and lower atmosphere. B、Most of it is reflected by the gases in the upper atmosphere. C、Most o
admin
2013-09-14
49
问题
We experience different forms of the Sun’s energy every day. We can see its light and feel its warmth. The Sun is the major source of energy for our planet. It causes the evaporation of water from the oceans and lakes. Sunlight also provides the energy used by green plants to make their own food. These green plants then provide food for all organisms on the Earth.
Much of the energy that comes from the Sun never reaches the Earth’s surface. It is either reflected or absorbed by the gases in the upper atmosphere. Of the energy that reaches the lower atmosphere, 30% is reflected by clouds or the Earth’s surface. The remaining 70% warms the surface of the planet, causes water to evaporate, and provides energy for the water cycle and weather. Only a tiny part, approximately 0.023%, is actually used by green plants to produce food.
Many gases found in the atmosphere actually reflect heat energy escaping from the Earth’s surface back to the Earth. These gases act like the glass of a greenhouse in that they allow energy from the Sun to enter but prevent energy from leaving. They are therefore called greenhouse gases.
When sunlight strikes an object, some of the energy is absorbed and some is reflected. The amount reflected depends on the surface. For example, you’ve probably noticed how bright snow is when sunlight falls on it. Snow reflects most of the energy from the Sun, so it contributes to the low temperatures of winter. Dark-colored surfaces, such as dark soil or forest, absorb more energy and help warm the surrounding air.
Questions 19 to 21 are based on the passage you have just heard.
19. What is the root cause for weather changes on the Earth according to the passage?
20. Why does only a small part of the Sun’s energy reach the Earth’s surface?
21. What do we learn from the passage?
选项
A、Most of it is lost in the upper and lower atmosphere.
B、Most of it is reflected by the gases in the upper atmosphere.
C、Most of it is absorbed by the clouds in the lower atmosphere.
D、Most of it is used to evaporate water from the oceans and lakes.
答案
A
解析
由选项中重复出现的Most of it is及lost,reflected,absorbed,used to evaporate和atmosphere可推断,it指代energy from the sun,故本题很可能考查太阳射向地球的大部分能量受大气层的影响而无法到达地球表面的原因。短文中提到It is either reflected or absorbed by the gases in the upper atmosphere.Of the energy that reaches the lower atmosphere,30% is reflected by clouds or the Earth’s surface,也就是说太阳的能量被上层大气反射或吸收,当剩下的能量穿过低大气层时,有30%的能量被云或地球表面反射出去,最后只剩下一小部分到达地面,故答案为A)。选项中的it指的是energy from the sun。注意短文给出的数字对选择答案起关键作用。
转载请注明原文地址:https://kaotiyun.com/show/KBc7777K
0
大学英语四级
相关试题推荐
TheAmericanRevolutionwasnotarevolutioninthesenseofaradicalortotalchange.Itwasnotasuddenand【S1】______overt
A、Thewomanshouldhavefinishedherprojectbynow.B、Thewomanshouldworkonherworkforonemoreweek.C、Thewomanshouldn’
A、Hewenttoseehiscousin.B、Hewasheldupintraffic.C、Hiscarranoutofgas.D、Hehadatrafficaccident.B题目询问男士出了什么事。关键
DoCleanSmellEncourageCleanBehaviorYearsago,socialscientistsintroducedthebroken-windowstheoryofcrimecontrol,
Whydoesn’ttheauthorwanttotalkaboutbeingawomanscientistagain?Whatdoestheimagetheauthorpresentstoherstudent
Whydoesn’ttheauthorwanttotalkaboutbeingawomanscientistagain?Whydoestheauthorfeelgreatsatisfactionwhentalki
A、Theyareusedforrescuework.B、Theyaretakingtheplaceofhighflyingjets.C、Theyhavebeenwidelyusedforvariouspurpos
A、Hecan’tfindgoodexamplestoillustratehispoint.B、Hecan’tfindapeacefulplacetodotheassignment.C、Hedoesn’tknow
A、Thedifferentstagesof"cultureshock"indetails.B、Thevariousaspectsofemotionalconfusion.C、Someusefuladvicetothe
OnSchoolBusSafety1.现在,很多中国孩子,包括农村的和城市的,都选择乘校车上学2.校车事故频发,引发人们关注3.保障校车安全,我认为……
随机试题
心绞痛是冠状动脉供血不足,心肌急剧的、暂时缺血与缺氧所引起的以发作性胸痛或胸部不适为主要表现的临床综合征。抗心绞痛药物主要通过扩张血管、减慢心率,降低左室舒张末期容积而减少心肌耗氧量;通过扩张冠脉、促进侧支循环,开放和促进血液重新分布等增加心肌氧的供给;通
依《反倾销条例》,有关价格承诺的下列说法,哪项是正确的?()
健康保险中都规定有免赔额条款,其中,单一免赔额扣除的对象是( )。
在接待宗教旅游团(者)时,要求导游人员做到()。
A、 B、 C、 D、 D题干图形交替有竖直对称轴与水平对称轴。
对于关键字序列(26,25,72,38,8,18,59),采用散列函数H(Key)=Keymod13构造散列表(哈希表)。若采用线性探测的开放定址法解决冲突(顺序地探查可用存储单元),则关键字所在散列表中的地址为______。
Hersisterurgedhertoapplyforthejob.
WhatisthevalueofworkforMr.Smith?
Modernlifestylesmeanthatmanyparentshavelittletimefortheirchildren.Manychildrensufferbecausetheydonotgetasmuc
A、Hardwaresupport.B、Softwaresupport.C、Feedbackanalysis.D、Dataanalysis.B女士让男士描述一下当前的工作,男士在原文中提到他目前的工作包括做系统分析、问题解答以及提供软件支持
最新回复
(
0
)