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 该题问“根据原文,可以通过采取什么措施来防止一些农作物疾病的发生?”A说“把寄生虫杀死”,D说“改善农作物的生长条件”,C说“把所有的昆虫都杀死”,这三个选项在文章中都没有提到,所以选择B。
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