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
48
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://kaotiyun.com/show/dI87777K
0
大学英语四级
相关试题推荐
Itusedtobethecasethatifyouleftyourcarinthesunonahotsummer’sday,thengettingbackinagainafterwardswasago
Smokingisconsidereddangertothehealth.Ourtobaccoseller,Mr.Johnson,therefore,alwaysaskshiscustomers,iftheyarev
Thestudentsare______(不是兴奋而是感到迷惑)whentheyaretoldthathavewonthegame.
A、Aformaltalkbetweenthebossandhissecretary.B、Aninformaltalkbetweentwofriends.C、Aformaltalkbetweenaprofessor
Veryfewpeoplecangetcollegedegreebefore11,butMichaelwasanexception.Hestartedhighschoolwhenhewas5,finishing
A、Themanatfirstmisunderstoodandcriticizedthewoman.B、Themandidn’twanttohelpthewoman.C、Themanwassoangrythat
Withmoreandmoreparentsworkingoutsidethehome,studentsareveryawarethatitisdifficultforschoolofficialstocontac
Inthistechnicalbusinessworld,theprocessofmanagementdecision-makinghasgrowncomplex.Thereis,however,alimittothe
Shynessisthecauseofmuchunhappinessforagreatmanypeople.Shypeopleareanxiousandself-conscious;thatis,theyare【B
A、Itistheabilitytogethighscoresonsometests.B、Itistheabilitytodowellinschool.C、Itistheabilitytodealwith
随机试题
肝功能不正常患者避免使用
记忆包括三个基本过程,它们是( )、保持和提取。
[2011年,第66题]矩形截面简支梁梁中点受集中力F。若h=2b,分别采用图5.8-4(a)和(b)两种方式放置,图(a)梁的最大挠度是图b梁的()。
人机系统中,适合于机器做的工作有()类型的工作。
与横道图计划相比,网络图计划的优点是()。
外国证券机构直接从事B股交易的申请可由()受理。
根据我国公司法的规定,( )。
根据植物新品种保护条例的规定,下列哪些说法是正确的?
Ifyouwantajoboftakingcareofchildren,whichadwillyouanswer?Youwillcall______ifyouwanttobuyaradio.
找工作
最新回复
(
0
)