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 sometimes, 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 discourage even bigger polluters from【C20】______.
【C8】

选项 A、detail
B、motion
C、vain
D、question

答案B

解析 根据句中表达让步和转折的although可推断,句中表示奥巴马计划完成情况的两个短语be in——与be in the air具有相反的语义。be in the air表示“未定的,悬而未决的”,be in motion“在运行中”符合要求,故选B。
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