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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?
admin
2009-06-15
112
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
根据段落构成的基本规律,段落开始是主题句,内容表达是顺着这一主题逐步展开。方式由一般到具体。选项C和D不可能是正确答案。剩下的A和B都是一般的论述,但从 tolerance(“忍耐力”)跟immunity(“免疫力”)意义上的相近性可以看出,B是对A的补充说明。因此正确的选项是A。
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