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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【S2】______
very much worse.
    For reasons both economic or political coal is poised to be the【S3】______
fuel of choice in the coming decades as the US weans itself off
foreign oil. Coal combustion generates half the US’s electricity and
releases at 1. 5 billion tons of carbon dioxide a year. If present【S4】______
trends continue, these figures will be more than double by 2050,
much on to the detriment of the world’s climate. Without an【S5】______
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【S8】______
and congressional 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【S9】______
emissions so utilities that invest in technologies to reduce carbon
emissions will see their efforts rewarding. Such a move would not【S10】______
only reduce the risks associated with global warming, but also go a
long way to restoring America’s green credentials.
【S2】
选项
答案acted—acts
解析 时态错误。本句是unless引导的条件状语从句，是一种假设，因此使用一般现在时，而不是过去时。
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