孕激素避孕的主要环节是
A．抑制排卵
B．抗着床
C．影响子宫收缩
D．影响胎盘功能
E．杀灭精子
参考答案：A
不等式2x>3-x的解集是[ ]
A.x<2
B.x>2
C.x>1
D.x<1
Whom would you rather _________ you to the hospital?
A．have sending
B．have send
C．having send
D．having sent
