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There are hidden factors which scientists call " feedback mechanisms ". No one knows quite how they will 【C1】______ with the cha
There are hidden factors which scientists call " feedback mechanisms ". No one knows quite how they will 【C1】______ with the cha
admin
2010-06-26
8
问题
There are hidden factors which scientists call " feedback mechanisms ". No one knows quite how they will 【C1】______ with the changing climate. Here’s one example: plants and animals, 【C2】______ to climate change over centuries.【C3】______ the current estimate of half a degree centigrade of warming per decade, vegetation may not keep 【C4】______. Climatologist James Hansen predicts climate zones will shift toward the poles【C5】______50 to 75 kilometers a year—faster than trees can naturally migrate. Species that【C6】______ themselves in an unfamiliar environment will die. The 1,000-kilometre wide strip of forest running【C7】______Canada, the USSR and Scandinavia could be cut 【C8】______. Millions of dying trees would soon lead to massive forest fires, 【C9】______ tons of CO
2
and further boosting global warming.
There are dozens of other possible "feedback mechanisms". Higher temperatures will【C10】______ condensation and increase cloudiness, which may actually【C11】______ down global warming. Others, like the "albedo" effect, will do the【C12】______. The "albedo" effect is the amount of solar energy reflected by the earth’s surface. As the northern ice and snow【C13】______and the darker sea and land pokes through, more heat will be absorbed,【C14】______ the temperature increase.
Even if we【C15】______ to magically stop all greenhouse-gas【C16】______ tomorrow the impact on global climate would continue for decades.【C17】______ will simply make the problem worse. In the developed world prosperity has been 【C18】______on 150 years of cheap fossil fuels. Material progress has been linked 【C19】______ energy consumption. Today 75 percent of all the world’s energy is consumed by a quarter of the world’s population. The average rich world 【C20】______adds about 3. 2 tons of CO
2
yearly to the atmosphere, more than four times the level added by each Third World citizen.
【C4】
选项
A、off
B、down
C、on
D、up
答案
D
解析
固定搭配题。四个选项均能与keep搭配,但意义不同:keep off“让开,不接近”;keep down“卧倒,镇压,控制,缩减”;keep on“继续,穿着……不脱”;keep up“保持,跟上”。根据原文意思,[D]为答案。
转载请注明原文地址:https://kaotiyun.com/show/YG1K777K
0
专业英语四级
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