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  3. Global warming refers to an increase in global surface temperature resulting from an increase in the amount of carbon dioxide, m

Global warming refers to an increase in global surface temperature resulting from an increase in the amount of carbon dioxide, m

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问题     Global warming refers to an increase in global surface temperature resulting from an increase in the amount of carbon dioxide, methane, and certain other trace gases in the atmosphere. These gases are【S1】______known as greenhouse gases because they【S2】______to the warming of the earth’s surface and lower atmosphere, a phenomenon called the greenhouse effect. Partly because the【S3】______of carbon dioxide is related to the essential use of the carbon based energy sources, the【S4】______of global warming incorporates a broad, scientific and political debate about its significance and consequences.
    Today, as the results of the efforts of thousands of scientists over several decades who have studied climate and its【S5】______with the global land-ocean-atmosphere system, the scientific understanding of global warming is both more clear and complex. Scientists have obtained strong【S6】______that climate does indeed change, on scales【S7】______from a few seasons to millennia. Scientists have further shown that human activities can indeed influence the climate.
    As a sign of change in the international responses to global warming, delegates at a meeting under the Framework Convention on Climate Change in 2002 in New Delhi issued a declaration concluding that "Actions are required to【S8】______energy supply by developing advanced, clearer, more efficient, affordable and cost-effective energy technologies". No matter how the science and politics【S9】______over the coming years, one fact remains【S10】______: global warming presents a challenge that will be with us for decades and perhaps centuries to come.

A)irrefutable       B)contribute           C)diversify            D)evolve
E)irrelevance       F)collectively         G)emission             H)issue
I)claim             J)question             K)interconnection      L)respectively
M)evidence          N)ranging              O)devote
【S4】
选项
答案H
解析 此处需一名词单数形式作主语，名词issue(议题，争议点)的英文含义是“an important subject of debate and litigation”，符合要求，例如the issue of overtime pay/homelessness。名词question(问题)不符合句意。
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