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  3. President Barack Obama claimed progress Wednesday in his second-term drive to combat climate change but said more must be done t

President Barack Obama claimed progress Wednesday in his second-term drive to combat climate change but said more must be done t

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问题     President Barack Obama claimed progress Wednesday in his second-term drive to combat climate change but said more must be done to address a generational problem.
    One year after unveiling an aggressive plan, Obama said new【C1】________limits on power plants, renewable energy projects and new【C2】________for green technology have cleared the way for further action in the U.S. and abroad, despite steadfast【C3】________from much of Congress.
    "When you take those first steps, even if they’re【C4】________, and even if there are politics some-times, you start【C5】________momentum and you start mobilizing larger and larger communities," Obama said.
    Obama’s【C6】________served as a progress report for his climate plan, which the president【C7】________out last June. Twelve months later, much of the plan is in【C8】________although the most ambitious steps are still up in the air and will take years to be【C9】________realized.
    Change won’t be instantaneous, Obama【C10】________. "There’s no silver bullet."
    Indeed, many of the steps he’s taking are【C11】________limited in scope by hostility from both parties to putting a【C12】________on carbon pollution, which would require new laws from Congress. Still, Obama said he’s seeking to【C13】________the problem but cutting it up into smaller pieces.
    "We’re moving, and it’s making a【C14】________," he told a supportive crowd at the League of Conservation Voter’s annual dinner. The environmental group【C15】________Obama early in his 2008 campaign.【C16】________on the international front, momentum has been obscure.【C17】________global climate talks next year in Paris, there are fresh【C18】________that some countries are urging others to resist【C19】________moves to curb carbon. That could dis-courage even bigger polluters from【C20】________.  
【C17】
选项 A、At the beginning of
B、At the end of
C、Ahead of
D、In the course of
答案C
解析 主句中there are和are urging所用的现在时态提示主句所提之事会在明年举行的气候谈判之前发生。选项中表示“在……之前”的只有C项Ahead of。举办会议的时间在将来，而现在发生的事情与它的关系不可能用A项At the beginning of“在……的开始”、B项At the end of“在……结束时”或D项In the course of“在……期间”来表达。因此，均被排除。
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