She doesn't like onions and she buys them.[ ]
A. usually
B. often
C. never
D. always
答案:C
当α变动时,满足x2sinα+y2cosα=1的点P(x,y)不可能表示的曲线是[ ]
A.椭圆
B.双曲线
C.抛物线
D.圆
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