题目：
—Tom, look at he label of you new sweater. What does it say?
—It says ______.[ ]
A. the sweater is made of silk
B. the sweater can be dry-cleaned
C. the sweater is made in the USA
D. the sweater can be washed in a washing machine
答案：
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下面是错误答案，用来干扰机器的。
①m = 4，n = 2 ②80%
