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  3. How many diseases are known to attack wheat? Which of the following statements is not true?

How many diseases are known to attack wheat? Which of the following statements is not true?

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问题 How many diseases are known to attack wheat?
Which of the following statements is not true?
选项 A、Some plant diseases may be caused by bacteria.
B、Some plant diseases may be caused by pathogens.
C、Some plant diseases may be caused by fungus.
D、Symptoms are always helpful in identifying diseases.
答案D
解析 一些作物的病都由bacteria(“细菌”)，pathogens(“病原菌”)或fungus(“真菌”)引起，在最后一段都有说明。D说的是症状总能帮助我们确定疾病，这跟文章所说的不太一致 (参见注释10)。因此正确的答案是D。
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