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

On Feb. 2, 2007, the United Nations scientific panel studying climate change declared that the evidence of a wanning 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 wanning 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【S1】______
the 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 mounting scientific evidence that the release of carbon dioxide【S2】______
and other heat-trapping gases from smokestacks, tailpipes and
burning forests have played a central role in raising the average【S3】______
surface temperature of earth by more than 1 degree Fahrenheit【S4】______
in 1900. It also added new momentum to a debate that now seems【S5】______
to center less over that humans are warming the planet, but instead【S6】______
over what to do about it. In recent months, business groups have
banded together to make unprecedented calls to federal regulation of【S7】______
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 made its【S8】______
first global warming-related decision, ruling 5 to 4 that the
Environmental Protection Agency had not justified their position that【S9】______
it 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【S10】______
atmosphere reaches twice 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.
【S5】
选项
答案in一since
解析 语义错误。根据上文可知，“自1900年以来，气温上升了l华氏度”，而不是在1900年，因此改为since更合适。
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