Global warming is already cutting substantially into potential crop yields i

游客2023-11-05  16

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. [br] 【C8】

选项 A、extra
B、overt
C、extraordinary
D、exceeding

答案 A

解析 词义辨析题。此处需要选一个形容词描述人类排放的二氧化碳的量,根据这段话结尾处的greenhouse gas“温室气体”,可知要填一个能够表示过量排放的词,所以选择extra“超额的,过量的”。overt“公开的。明白的”,extraordinary“不平常的,不普通的”;exceeding“极度的,超越的”,均不能表示某事物过量的意思,所以可以排除。
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