How many diseases are known to attack wheat? What is the main idea of the second paragraph?

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问题 How many diseases are known to attack wheat?
What is the main idea of the second paragraph?

选项 A、Some plants have relative immunity to a great many diseases, while others have a susceptibility to them.
B、The tolerance of a particular plant changes as the growing conditions change.
C、A blight killed virtually every chestnut tree in North America.
D、A blight may be a national infection.

答案A

解析 该题问“第2段的主要大意是什么?”抓住该段的段首句(段首句往往是主题句)。A的表述方式及内容与该段的段首句一致。
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