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
50
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
Womenstillhaveanuneasyrelationshipwithpowerandthetraitsnecessarytobealeader.Thereisthisinternalizedfearthat
A、Peoplebecamecourageous.B、Socratestaughtyoungmenevilthings.C、Socrates’ideasdidharmtotheirruling.D、Peopleweree
A、leftpocket.B、rightpocket.C、backpocket.D、frontpocket.A细节考核题,在文章第一段,考生应抓住关键词:Pocket,来找到答案。注意文章第—句话、.thatalmostalways
A、Thelongeststreetintheworld.B、AnadvertisementonTV.C、Aplaceofinterest.D、ATVprogram.D本题询问“芝麻街”是什么。文中说“芝麻街”被誉为世界上
YouthofToday--Nosavings,nopension,hugedebts--Leavingschooloruniversitymeansfinancialindependence--bu
Sunlightiscomposedofsevencolors,____________(世界也是)fullofdifferentcolors.
______equaleducationaladvantages,therewillbenodifferenceinaveragestandings,eitheronaccountofraceorgeographical
A、Jimjoinedthearmyafterleavingthefarm.B、JamesA.GarfieldwasJim’sidol.C、TaylormustregretrefusingJim.D、Taylorsu
Jimknowslittleofmathematics,______ofchemistry.
ABriefHistoryofOnlineShoppingWhenAmazon.comopenedforbusiness15yearsago,itwasnothingmorethanafewpeoplep
随机试题
动态作业的特点之一是
下列关于大体积混凝土的浇筑,说法正确的是()。
某土石坝工程项目法人与施工单位签订了工程施工合同,合同中估算工程量为8000m3,单价为200元/m3,合同工期为6个月,有关付款条款如下:(1)开工前项目法人应向施工单位支付合同总价20%的工程预付款。(2)项目法人自第一个月起,从施
施工过程中的消防验收包括()。
某四层钢筋混凝土框架结构办公楼,图a为其结构平面图,各层结构均以此为准,图b为独立柱基础剖面图,图c为YL3梁配筋图,各号钢筋均为Ⅰ级钢,其中①、②、③号钢筋两端有半圆弯钩,②号钢筋弯起角度为45°,箍筋弯折的长度调整值为1OOmm。箍筋混凝土保护层厚度为
在学习过程中,学习者采用在主题句下画线的方法帮助自己学习,这种学习策略属于()
将一个数转换成相应字符串的函数是( )。
Lookatthestatementsbelowandatthefivesummariesofarticlesaboutstrategicchangefromajournalontheoppositepage.W
Itisappropriateonananniversaryofthefoundingofauniversitytoremindourselvesofitspurposes.Itisequallyappropria
Overtheyears,I’veheardafairnumberofslursshoutedatcampuscops.Seldomwerethey"pig"or"fascist."Farmoreoften,
最新回复
(
0
)