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
70
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
A、Henryusuallyworksdiligently.B、Henryhasbecomeamuchbetterstudent.C、Henryhaschangedherstudyhabitslately.D、Henry
A、Theclubneedssomesportsaswell.B、Raisingthemoneywillbehard.C、Allthestudentswouldlikeformalball.D、Thefestiva
Veryfewpeoplecangetcollegedegreebefore11,butMichaelwasanexception.Hestartedhighschoolwhenhewas5,finishing
Inthistechnicalbusinessworld,theprocessofmanagementdecision-makinghasgrowncomplex.Thereis,however,alimittothe
Easteriscelebratedeveryspring.IiisalwayscelebratedonaSunday.Easterhasits【C1】______inmanytraditions【C2】______
Onewayofpreventingfloodsmaybebymakingrain!Thismaysoundratherstrange.Asweknow,heavyrainisthecauseofflood
A、November.B、December.C、June.D、March.A短文第二句明确提到NovemberisNationalAdoptionMonth。
A、Attwoo’clock.B、Atthreeo’clock.C、Atfouro’clock.D、Atfiveo’clock.D综合推断题。女士说是凌晨两点起的火,男士说消防员用了三个小时将其扑灭,由此可知,火被扑灭的时间是五点
A、Indifferent.B、Surprised.C、Confident.D、Worried.D选项均为表示态度的词表明,本题考查观点看法。由短文中提到的Themajordifference…pointsoutthetragicch
随机试题
有关淋巴瘤,错误的是
根据《水运工程混凝土施工规范》(JTS202—2011)对拌和用水的规定,预应力混凝土拌和用水的pH应大于()。
试论述国家作为国际经济法主体的资格。
小便点滴不通,或量极少而短赤灼热,小腹胀满,苔黄舌质红,脉数,其治法
关于胎儿发育,下列正确的是
药师调剂处方时应关注过敏药物试验及结果判定,下列在注射前无须做皮试的药物是()。
王女士患肺结核在家疗养,但痰中仍疑有结核菌,对其痰液最简便有效的处理方法为
FIDIC《施工合同条件》中关于争端裁决委员会的规定,下列表述正确的是()。
根据法律规定,下列行为中,属于效力未定法律行为的有()。
Thepapercompanywishesto______itsnewfactorybesidetheriver.
最新回复
(
0
)