问题
选择题
Steven always wears pants, but he wears dresses.[ ]
A. usually
B. sometimes
C. never
D. always
答案
答案：C
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Steven always wears pants, but he wears dresses.[ ]
A. usually
B. sometimes
C. never
D. always
答案：C
，其中P与q为非整数，且m2是一个整数。
，其中p与q为非整数，且
是一个整数。