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、Relations of grain and meat.
D、Social upheavals.

答案D

解析 该题问“根据原文,如果不制止农作物疾病的发作,农作物疾病会导致什么后果?”文章的第1段提到了食物的短缺可能造成政治动乱,所以选择D“社会动乱”。
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