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
We experience different forms of the sun’ s energy every day. The sun is the major source of energy for our planet. It causes th
We experience different forms of the sun’ s energy every day. The sun is the major source of energy for our planet. It causes th
admin
2014-03-16
30
问题
We experience different forms of the sun’ s energy every day. The sun is the major source of energy for our planet. It causes the evaporation(蒸发)of water from the oceans and lakes. Sunlight also provides the energy used by green plants to make their own food.
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. Dark-colored surfaces, such as dark soil or forest, absorb more energy.
We learn from the passage that
选项
A、all living things on the earth depend on the sun for their food
B、a forest looks dark in winter because it absorbs solar energy
C、only 0. 023 of the energy from the sun is made use of on the earth
D、greenhouse gases allow heat energy to escape from the earth’ s surface
答案
A
解析
推理判断题。由第一段可知:阳光给绿色植物提供能量使其生产自己的食物,故诜A。
转载请注明原文地址:https://kaotiyun.com/show/G7wd777K
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
Whatistheprobablerelationshipbetweenthetwospeakers?
Whatdopeopleusuallydoinordertogetatableinthisrestaurant?
Kristy,28,acookinLaCross,oftenwonderedwhatshe’ddoinalife-threateningsituation.OnAugust29,1997,shegothexan
--Ialwaysgetlostdrivingonthisfly-over.--Funnyyoushouldsaythat;something______happenedtomeonce.
WhatIsWorldEnglish?WorldEnglishisacourseintheEnglishlanguage.Itisintendedforstudentswhosenativelanguagei
Onesummerdaymyfathersentmetobuywireforourfarm.At16,Iliked【C1】______betterthandrivingourtrack,【C2】______this
Therearestockmarkets(股票市场)inlargecitiesinmanycountries.Thestockexchangeisaplacewherepeoplecanbuyorsellshar
DearRalph,I’manewcomerhereofasmalltown.Iwould【76】______describemyselfasshyandquietly.B
DearRalph,I’manewcomerhereofasmalltown.Iwould【76】______describemyselfasshyandquietly.B
Afteralongdiscussion,they______anagreement.
随机试题
设int类型的数据长度为2个字节,则unsignedint类型的数据取值范围是()
急性肾衰竭少尿期一般持续
对楼板的要求有()。
关于基金销售机构的职责规范,下列表述错误的是()。Ⅰ.客户身份资料自业务关系结束当年起至少保存15年,与销售业务有关的其他资料自业务发生当年起至少保存15年Ⅱ.基金管理人、基金销售机构应当建立健全档案管理制度,妥善保管基金份额持有人
在上海证券交易所市场,投资者需要通过托管券商领取的收入包括()。Ⅰ.红利Ⅱ.股息Ⅲ.债息Ⅳ.债券兑付款
政策评价的含义是()。
根据下列图表,回答问题。分析城镇与乡村人口的变化,不属于我国人口形势变化的是()。
下列因素变化不会引起需求曲线移动的是:
Thelong-anticipatedHongKongDisneyland,the11thDisney-themedParkintheworldandthefirstinChina,successfullyopened
Anabbreviation(缩写词)canbedefinedasashortenedformofawordorterm.Abbreviationsareanattempttocommunicateinform
最新回复
(
0
)