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
During the early period of the earth’s history, the weather on earth apparently fluctuated between bright sun and showers. In re
During the early period of the earth’s history, the weather on earth apparently fluctuated between bright sun and showers. In re
admin
2010-06-30
59
问题
During the early period of the earth’s history, the weather on earth apparently fluctuated between bright sun and showers. In recent times, however, the mountains and valleys on land and under water have had a great influence on the earth’s weather. They effect the movements of the thin film of water we call the sea and the thin layer of air around the earth. These movements produce changes in the temperature and humidity prevailing at the surface.
Although the sun is approximately 93 million miles away, its rays warm the earth. The areas that receive the sun’s rays vertically are, naturally, warmer than those areas that receive only slanting rays. 【61】
Vertical rays do not need to make as long a journey through the atmosphere before reaching the surface of the earth. Therefore, less of their heat is lost in the air and more of their heat is saved to warm the earth. Furthermore, slanting rays are spread over available at a given point.
The sun’s rays do not heat the vast stretches of space between the sun and the earth. 【62】
If they did, we should expect to be warmer on top of a high mountain or riding in an airplane than we are on the ground.
Actually, however, we feel cooler at the top of a mountain; and, if we fly a plane high enough, we encounter freezing temperatures, even over the equator.
This is true because the sun’s rays are like the waves used in radio broadcasting. Music sent out by a radio transmitter does not fill the air with sounds for all to hear. Instead, the music travels in the form of electromagnetic waves, which must pass through a receiver and an amplifier to be heard. 【63】
Similarly, the sun’s rays cross our atmosphere and are absorbed by the surface of the earth. These rays warm the surface, which sends back some of this heat into the air.
When the air near the earth’s surface has been warmed, it rises and is replaced by cooler air which comes down to take its place. This cool air, in turn, is warmed and rises to be replaced by more cool air. As air rises it becomes cooler because it expands and is less concentrated, the air is suddenly let out of a tire, the air expands rapidly and becomes much cooler. On the other hand, when air is put under greater pressure, it becomes warmer. This is what happens to the cold air that comes down to take the place of rising warm air.
The earth is much cooler than the sun, and the wave length of the earth’ s radiations is much longer than that of sun rays. 【64】
These longer heat waves cannot pass through the atmosphere as easily as the short waves coming from the sun.
【65】
Similarly, radio stations that transmit programs to distant countries broadcast in short waves, which can travel all round the world.
Stations that broadcast local programs send out longer waves, which can be received more easily, but only in a limited area.
【61】
选项
答案
垂直光穿过大气层到达地面无需走那么长的路程。
解析
转载请注明原文地址:https://kaotiyun.com/show/iQJd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
YouwillhearaconversationbetweenMissGreen,aneducationaljournalist,andProfessorWilson,anexpertineducationalstudi
YouwillhearaninterviewwithStevenCasey,onhumanfactorsindesign.Asyoulisten,answerthequestionsorcompletetheno
Youmaysaythatthebusinessofmarkingbooksisgoingtoslowdownyourreading.【C1】______probablywill.That’soneofthe【C2
Youmaysaythatthebusinessofmarkingbooksisgoingtoslowdownyourreading.【C1】______probablywill.That’soneofthe【C2
Thepasttype/past-orientedpeople.
In1935,MaryKaygotmarriedforthefirsttime.MaryKaystoppedrunninghercompanyin2000.
Wehaveescapedthebattlefieldandnowcan,withmodemguidancesystemonmissies,touchvirtuallyeverysquareyardoftheea
Wehaveescapedthebattlefieldandnowcan,withmodemguidancesystemonmissies,touchvirtuallyeverysquareyardoftheea
Surgeonswillsoonbeabletoentertheeyetocarryoutoperations—atleastinavirtualsense.Techniquesderivedfromvirtual
AmericaTheBeautiful,isasongalmosteveryAmericancansing.Andwhileit’struethatTheStarSpangledBannerhasbeenAmeri
随机试题
属于感觉神经节的是
A.利尿剂B.洋地黄制剂C.钙通道阻滞剂D.ACEI肥厚型心肌病引起的舒张性心衰首选治疗药物是
津伤化燥多发生的脏腑是
修饰雌二醇为长效或口服药物的方法是
根据《公路试验检测数据报告编制导则》要求,()构成了公路工程试验检测数据报告。
乙企业会计主管离任,由李某接任。李某接任后其女儿已取得会计从业资格证书,李安排其女儿任出纳。因财务人员较少,乙企业未设立会计档案机构,李某要求出纳兼管会计档案。一天,反贪局到乙企业调查前任会计主管的经济问题,会计档案保管人员得到李某同意后,将部分记账凭证和
下列各项不属于客户经理的工作内容的是()。
“尘世难逢开口笑,菊花须插满头归”描写的是哪一个中国传统节日?()
一、注意事项1.申论考试与传统的作文考试不同,是分析驾驭材料的能力与表达能力并重的考试。2.仔细阅读给定的资料,按照后面提出的“作答要求”依次作答在答题纸指定位置。二、给定资料1.2011年6月,我国CPI(消费者物价指数)进
[2008年GRK真题](1)一(2)题基于以下题干:以下是在一场关于“安乐死是否应合法化”的辩论中正反方辩手的发言:正方:反方辩友反对“安乐死合法化”的根据主要是在什么条件下方可实施安乐死的标准不易掌握,这可能会给医疗事故甚至谋杀造成机会,使一些本来可以
最新回复
(
0
)