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
In the United States the science of climate change still remains a controversial issue. Part of the problems is that it is compl
In the United States the science of climate change still remains a controversial issue. Part of the problems is that it is compl
admin
2010-09-10
41
问题
In the United States the science of climate change still remains a controversial issue. Part of the problems is that it is complex and hard to isolate its parts. We do know how vital it is to life. The atmosphere forms a gaseous, protective envelope around earth protecting the earth from the cold of space, from harmful ultraviolet light, and from all but the largest meteors. After traveling over 93 million miles, solar energy strikes the atmosphere and earth’s surface, warming the planet and creating what is known as the "bio sphere" which is the region of earth capable of sustaining life. Atmospheric circulation is one important reason that life on earth can exist at higher latitudes because equatorial heat is transported poleward, moderating the climate.
The atmosphere is not just a protector but also a great transporter. The transport of water vapor in the atmosphere is an important mechanism by which heat energy is redistributed poleward. Heat energy absorbed at the equator is deposited at the poles and the temperature gradient between these regions is reduced. The circulation of the atmosphere and the weather it generates is but one example of the many complex, interdependent events of nature. The web of life depends on the proper functioning of these natural mechanisms for its continued existence.
Some argue that climate change is too complicated to be attributed only to human activity. For example, fossil studies of radiolaria, a group of one-celled animals characterized by silicon-containing shells, have given scientists a fairly accurate account of climatic conditions in the distant past. Geologists found these 450,000-year-old microorganisms pre served in cores of sediment taken beneath the floor of the Indian Ocean. They provide a re cord of cycles of climatic changes, determined by the alternating layers of species of warm and cold-preferring radiolaria. We now have confirmation that changes in the earth’s orbital geometry caused the ice ages.
This does not let us off the hook because although we can hardly alter the basic forces at work that alter climate, even small contributions by humans can have dramatic effects. Given nature’s interconnectedness, it is possible that the most serious threats have yet to be recognized.
According to the text, fossil studies of radiolaria are significant because they.
选项
A、live in the depths of the ocean
B、are one-celled
C、have survived through the ages
D、demonstrates climatic changes prior to humans
答案
D
解析
属信息推断题。第三段讲到放射虫的化石研究这个例子,目的是为了证明本段主题即第一句话,“气候变化过于复杂,不能只归因于人类活动”。则证明在人类出现之前已经有气候的变化了。
转载请注明原文地址:https://jikaoti.com/ti/skAFFFFM
0
大学英语四级
相关试题推荐
HowtoLivetobe200TwentyyearsagoIknewamancalledJiggins,whohadtheHealthHabit.Heusedtotakeacoldplu
TheMinistryofEducationistoupgradeteachingmethodsand【B1】______incollegesanduniversitiesthroughoutthecountry.Thea
Havingnolanguage,infantscannotbetoldwhattheyneedtolearn.Yet,thefirstyearsoflifeisbelievedtobethemostfavo
A、Mr.Jonesmightfixtheradio.B、Shedoesn’twanttoworkforMr.Jones.C、Shedoesn’tliketospeaktoMr.Jones.D、Mr.Jones
A、ThegraduatestudentscouldunderstandtheFrenchlecture.B、TheundergraduatestudentscouldunderstandtheFrenchlecture.C
Easteriscelebratedeveryspring.IiisalwayscelebratedonaSunday.Easterhasits【C1】______inmanytraditions【C2】______
A、She’sonaspecialdiet.B、Shedoesn’tliketoeatinthecanteen.C、Shethinksthecanteenistooexpensive.D、Shehadnomon
Asresearcherslearnmoreabouthowchildren’sintelligencedevelops,theyare【S1】______surprisedbythepowerofparents.The
Nowtheincomegapisgettingwiderandwider.Insomeprivatelyownedfirms,【B1】______,orforeign-fundedcompanies,an【B2】___
A、Tuesdayattwoo’clock.B、Thursdayattwoo’clock.C、Thisafternoonatthreeo’clock.D、Now.A先看题日,再有针对性的认真听。依据会话中提到的"That’s
随机试题
同时供应外耳、中耳和内耳血液动脉是同时供应中耳和外耳血液的动脉是
取霍乱病人的米泔水样粪做悬滴观察,可见弧菌排列呈
女性,42岁。嵌顿性股疝6小时,经用力按压还纳疝块后1小时,腹部持续性痛伴下腹压痛,肌紧张,反跳痛,肠鸣音消失,此时应考虑
测定了8例正常人与8例Ⅰ期矽肺病人的血清黏蛋白(mg/100ml),得如下结果8例正常人结果:均数=58.09;标准差=12.668例Ⅰ期矽肺病人结果:均数=79.03标准差=11.60
(2017年)下列哪些情形中,行政机关应依法办理行政许可的注销手续?
【2010年第131题】在对柱下钢筋混凝土独立基础进行抗冲切计算时,冲切破坏锥体与基础底面的夹角为:
网络设备中HUB是指()。
证券公司、证券投资咨询机构发布证券研究报告应当遵守法律、行政法规和相关规定,遵循()原则。Ⅰ.独立Ⅱ.客观Ⅲ.公平Ⅳ.审慎
Aboutonecommercialbankoutofeveryfourhasatrustdepartmentthatprovidesspecializedfiduciaryservicesforitscustomer
有以下程序#include<stdio.h>#include<string.h>voidfun(char*s,intm1,intm2){chart,*p;p=s+m1;s=s+m2;wh
最新回复
(
0
)