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."
【C4】

选项 A、devoted
B、indifferent
C、vulnerable
D、immune

答案C

解析 上下文语义题。该段落只有一句话,主要是讲气候变化给热带地区所带来的影响,but. 后面的部分,previously considered to be “原先认为是”和are likely to become“如今可能会”可知,此处将过往的情况跟如今和今后的情况进行对比,今后的情况应该与前面提的secure相反,根据介词to后面的宾语“干旱、极端天气和气温升高的影响”,推断此处是讲很多地区容易遭受干旱等不利影响,C项vulnerable与to连用表示“易受……攻击”,符合句意。其他三项也能与to连用。A项devoted to意为“专心/专用于……”,填入句中为“安全的粮区可能变得专心/专用于干旱、极端天气和更高的气温”,语义不通。B项indifferent to意为“对……冷漠,漠不关心”,代入句中为“安全的粮区可能对于旱、极端天气和更高的气温漠不关心”,不符合常理。D项immune to意为“对……有免疫力”,可引申为“不受……影响”,代入句中跟文章要传达的“受到干旱、极端天气等的影响”意思相反。
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