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  3. Thanks in no small part to Al Gore and his film producers, the American public is waking up to the seriousness of global warmin

Thanks in no small part to Al Gore and his film producers, the American public is waking up to the seriousness of global warmin

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问题   Thanks in no small part to Al Gore and his film producers, the
American public is waking up to the seriousness of global warming.
That is not so widely appreciated is that unless the US government【S1】________
acted urgently and decisively, this problem could very quickly get very【S2】________
much worse.
  For reasons both economic or political coal is poised to be the fuel【S3】________
of choice in the coming decades as the US weans itself off foreign oil.
Coal combustion generates half the US’s electricity and release about【S4】________
1. 5 billion tons of carbon dioxide a year. If present trends continue,
these figures will be more than double by 2050, much on to the【S5】________
detriment of the world’s climate. Without an alternative fuel, the only
solution is to capture and store carbon dioxide from burning coal.
Overcome the engineering obstacles in the way of large-scale【S6】________
sequestration of carbon dioxide will be hard enough, and the bigger【S7】________
challenge is one of political will. US companies as yet have no incentive
to capture carbon emissions. While movements at state and congressional【S8】________
levels are pushing in the right direction, the ambiguity in the
administration’s policy is counterproductive.
  It is time for the US government to put price on carbon emissions so【S9】________
utilities that invest in technologies to reduce carbon emissions will see
their efforts rewarding. Such a move would not only reduce the risks【S10】________
associated with global warming, but also go a long way towards
restoring America’s green credentials.
【S5】
选项
答案去掉on
解析 介词冗余。to the detriment of the world’s climate表示“对世界气候造成危害”。on表示“在……之上”，在此处是多余的，故删掉。
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