2. 外语
  3. On Feb. 2, 2007, the United Nations scientific panel studying climate change declared that the evidence of a warming trend is

On Feb. 2, 2007, the United Nations scientific panel studying climate change declared that the evidence of a warming trend is

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问题     On Feb. 2, 2007, the United Nations scientific panel studying
climate change declared that the evidence of a warming trend is
"unequivocal", and that human activity has "very likely" been the
driven force in that change over the last 50 years. The last report by the【S1】________
group, the Intergovernmental Panel on Climate Change, in 2001, had
found that humanity had "likely" played a role.
    The addition of that single word " very" did more than reflect to【S2】_________
mounting scientific evidence that the release of carbon dioxide and other
heat-trapping gases from smokestacks, tailpipes and burning forests have【S3】_________
played a central role in raising the average surface temperature of earth【S4】__________
by more than 1 degree Fahrenheit in 1900. It also added new momentum【S5】__________
to a debate that now seems centered less over that humans are warming【S6】___________
the planet, but instead over what to do about it. In recent months,
business groups have banded together to make unprecedented calls to【S7】____________
federal regulation of greenhouse gases. The subject had a red-carpet
moment when former Vice President Al Gore’s documentary, "An
Inconvenient Truth", was rewarded an Oscar; and the Supreme Court【S8】____________
made its first global warming-related decision, ruling 5 to 4 that the
Environmental Protection Agency had not justified their position that it【S9】___________
was not authorized to regulate carbon dioxide.
    The latest report from the climate panel predicted that the global
temperature is likely to rise between 3. 5 and 8 degrees Fahrenheit
whether the carbon dioxide concentration in the atmosphere reaches twice【S10】_________
the level of 1750. By 2100, sea levels are likely to rise between 7 and
23 inches, it said, and the changes now underway will continue for centuries to come.
【S10】
选项
答案whether—if
解析 连词误用。该句意为“来自气候专家小组的最新报告预测，如果大气中的二氧化碳浓度是1750年的两倍的话，地球温度将会上升3．5到8华氏度。”这里从句表示一种假设，而不是选择，因此只能使用if引导条件状语从句。
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