2. 外语
  3. How many diseases are known to attack wheat? According to the passage, some plant diseases can be prevented by

How many diseases are known to attack wheat? According to the passage, some plant diseases can be prevented by

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问题 How many diseases are known to attack wheat?
According to the passage, some plant diseases can be prevented by
选项 A、killing parasites.
B、inoculation.
C、killing insects.
D、improving growing conditions.
答案B
解析 A项说的是把寄生虫杀死。这在文章中没有提及。C项说的是把所有昆虫都杀死，显然也不对。D项说的是改善作物的生长条件，这在文章中也没有提到。因此，只有B项才是正确答案。
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