题目内容
（请给出正确答案）
[主观题]
What is the main idea of the second paragraph？A． Some plants have relative immunity to a g
What is the main idea of the second paragraph？
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.
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