2. 外语
  3. A. accelerate B. arguable C. consequently D. effect E. expected F. extra G. issue H. negligible I. off

A. accelerate B. arguable C. consequently D. effect E. expected F. extra G. issue H. negligible I. off

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问题    A. accelerate   B. arguable    C. consequently   D. effect     E. expected
   F. extra     G. issue     H. negligible     I. offsetting    J. prices
   K. raise     L. rise      M. surprisingly    N. temperatures   O. volume
   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 increases 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 each in India, France and China compared with what they probably would have been without rising 【C1】______, according to the study. Corn yields were off a few percentage points in China, Brazil and France from what would have been 【C2】______, said the researchers, whose findings were published in Friday’s 【C3】______ of the journal Science.
   Some countries saw small gains from the temperature increases, however. And in all agricultural countries, the 【C4】______ carbon dioxide that humans are pumping into the air acted as a fertilizer that encouraged plant growth, 【C5】______ some of the losses from rising temperatures caused by that same greenhouse gas. The study’s authors, 【C6】______, found that when the gains in some countries were weighed against the losses in other countries, the overall global 【C7】______ of climate change has been small so far: losses of a few percentage points for wheat and corn from what they would have been without climate change. The general impact on production of rice and soybeans was 【C8】______, with gains in some regions entirely counterbalancing losses in others.
   But the authors of the study pointed out that temperature increases were expected to  【C9】______ in coming decades, making it likely that the challenges to food production will grow in an era when demand is expected to 【C10】______ sharply.
【C7】
选项
答案D
解析 空格处应填入the overall global所修饰的名词。下一句以水稻和大豆为例，承接本句所说的话题，该句中的The general impact“一般影响”提示空格处应填入impact“影响”的近义词，effect“影响”符合要求，故选D项。本文讲气候变化对全球粮食产量的影响，issue“问题”代入句中，意为“气候变化的全球性问题”扩大了讨论的范围，故不选。
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