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

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 Patti 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."
【C15】
选项 A、until
B、since
C、while
D、unless
答案C
解析 语义逻辑题。此处填入逻辑连词，表明空格前后两分句间的关系。上一分句讲到超过30℃是大豆所能承受的最高温度，这里则讲一旦温度改变，玉米和大米的产量就会受影响，可见前后存在对比，能表示对比关系的只有C项while，意为“而”。
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