若0<y<1,那么代数式y(1﹣y)(1+y)的值一定是[ ]
A.正的
B.非负
C.负的
D.正、负不能唯一确定
答案:A
The reason I’m writing to you is to tell you about a party on Saturday.
A.because
B.why
C.how
D.which
泻白散与清骨散的组成中均含有的药物是
A.桑白皮B.地骨皮C.牡丹皮D.五加皮E.茯苓皮