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

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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