单选题：It is expected that crop yields will drop, especially in und

题目分类：理工类
题目类型：单选题
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题目内容：

It is expected that crop yields will drop, especially in underdeveloped countries,mainly because of______ ． A．disastrous weather
B．weak strains
C．finance shortages
D．revolutions

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分类：理工类题型：单选题

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