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The shorter growing seasons expected with climate change over the next 40 years will endanger hundreds of millions of already po

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问题     The shorter growing seasons expected with climate change over the next 40 years will endanger hundreds of millions of already poor people in the global tropics, say researchers working【C1】________the world’s leading agricultural organisations.
    The effects of climate change are likely to be seen across the entire tropical【C2】________but many areas previously considered to be【C3】________food secure are likely to become highly【C4】________to droughts, extreme weather and higher temperatures, say the researchers with the Consultative Group on International Agricultural Research.
    Intensively farmed areas【C5】________northeast Brazil and Mexico are likely to see their【C6】________growing seasons fall below 120 days, which is critical for crops【C7】________corn to mature. Many other places in Latin America are likely to【C8】________temperatures that are too hot for bean【C9】________, a staple in the region.
    The impact could be【C10】________most in India and southeast Asia. More than 300 million people in south Asia are likely to be affected even with a 5％ decrease in the【C11】________of the growing season.
    Higher peak temperatures are also expected to take a heavy【C12】________on food producers. Today there are 56 million crop-dependent people in parts of west Africa and India who live in areas where, in 40 years, maximum daily temperatures could be【C13】________than 30℃ . This is【C14】________to the maximum temperature that beans can tolerate,【C15】________corn and rice yields suffer when temperatures【C16】________this level.
    "We are starting to see much more clearly【C17】________the effects of climate change on agriculture could【C18】________hunger and poverty," said research leader Parti Kristjanson. "Farmers already【C19】________variable weather by changing their planting schedules. What this study suggests is that the speed of climate【C20】________and the magnitude of the changes required to adapt could be much greater."
【C16】
选项 A、assume
B、proceed
C、expect
D、exceed
答案D
解析 上下文语义题。此处填入谓语动词，与从句主语temperatures和宾语this level构成主谓宾搭配。其中this level就是指30℃。根据corn and rice yields suffer“玉米和大米的产量受到影响”和 “接近大豆所能承受的最高温度”，断定气温必定“超过”30℃才能使产量受到影响，故选D项exceed“超过”，表示“气温超过这个水平”。A项assume作“呈现出”讲时，通常指表现出某种状况，不宜与level“水平”构成动宾搭配。B项proceed作“前进”讲时，强调向某一方向移动，温度达到30℃这个水平不足以让产量受到影响，因为上文已提到30℃是所能承受的最高温度，故排除proceed。C项expect“预料，期待”用于主动语态时，其主语通常是人；若主语是物时，常用作be expected…，故expect与句中语境不符。
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