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  3. Global warming is already cutting substantially into potential crop yields in some countries—to such an extent that it may be a

Global warming is already cutting substantially into potential crop yields in some countries—to such an extent that it may be a

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问题     Global warming is already cutting substantially into potential crop yields in some countries—to such an extent that it may be a factor in the food price【C1】______that have caused worldwide stress in recent years, researchers suggest in a new study.
    Wheat yields in recent years were down by more than 10 percent in Russia and by a few percentage points【C2】______in India, France and China compared with【C3】______they probably would have been without rising【C4】______, according to the study.
    Corn yields were【C5】______a few percentage points in China, Brazil and France from what would have been【C6】______said the researchers, whose findings were published in Friday’s【C7】______of the journal Science.
    Some countries saw small gains from the temperature increases, however. And in all countries, the【C8】______carbon dioxide that humans are【C9】______into the air acted as a【C10】______that encouraged plant growth,【C11】______some of the losses from rising temperatures caused by that same greenhouse gas.
   【C12】______, the study’s authors found that when the gains in some countries were weighed【C13】______the losses in other countries, the overall global【C14】______of climate change has been small so far losses of a few percentage points for wheat and corn from what they would have been【C15】______climate change. The general impact on production of rice and soybeans was【C16】______, with gains in some regions entirely counterbalancing losses in others.
   【C17】______the authors of the study pointed out that temperature increases were expected to【C18】______in coming decades, making it likely that the challenges【C19】______food production will grow in a era when demand is expected to【C20】______sharply.
【C15】
选项 A、considering
B、with
C、concerning
D、without
答案D
解析 这句话的结构和含义与第2段第1句类似，均讨论粮食的收成比未受气候变化影响时的预期收成少了几个百分点。所以选D项without“没有”。
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