How many diseases are known to attack wheat? According to this passage, which of the following would a plant disease result in

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问题 How many diseases are known to attack wheat?
According to this passage, which of the following would a plant disease result in if left unchecked?

选项 A、A world war.
B、Border conflicts.
C、Rations of grain and meat.
D、Social upheavals.

答案D

解析 A：“世界大战”。B：“边界冲突”。C：“粮食和肉类定量供应”。这些文章并没有提到。 D：“社会动乱”。第一段讲到食物短缺可能造成政治动乱(political upheavals)。社会动乱和政治动乱意思比较接近，因此D为正确选项。

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