问题
单项选择题
1970年，美国发生了世界著名的玉米（）大流行，全部损失达10多亿美元。
A.锈病
B.大斑病
C.小斑病
D.病毒病
答案
参考答案：C
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1970年，美国发生了世界著名的玉米（）大流行，全部损失达10多亿美元。
A.锈病
B.大斑病
C.小斑病
D.病毒病
参考答案：C
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