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."
【C2】

选项 A、zone
B、segment
C、portion
D、sphere

答案A

解析 上下文语义题。空格处填入名词,被前面的tropical修饰。上一段提及了气候变化会危及到热带地(tropics)的贫困居民,此处依旧是讲气候变化所影响的区域,根据连词but后面的many areas推断空格处应填入表示地区或地域的词。zone意为“地带,区域”,与tropical连用表示“热带地区”,符合句意。B项segment “部分,片段”指某物的特定部分或自然形成的部分,也指线形物品的一段。C项portion意为“一部分”,侧重从整体中所分配到的那一部分。D项sphere作“领域”讲时,侧重于指活动、影响或兴趣范围,不用于指具体的地理区域。
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