（）不属于避孕机制。
A、改变女性生殖道内环境
B、杀死囊胚
C、抑制排卵
D、阻止精子和卵子相遇
E、改变宫腔内环境
参考答案：B
I’d like Jane, _____Joan, to go to the farewell party on behalf of (代表) our class.
A．more than
B．less than
C．rather than
D．or other
