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答案：
B
假设大数
（1）X>70, 用实验法，任意取值，当X=80的时候，Y小于4。当X=100时，Y可以等于4, 不充分。
（2）X<80, Y必须小于4，即便Y=4，那20B=80，否决条件了。充分。
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