卵子受精常发生于什么部位?
A. * *
B.子宫腔内
C.卵巢
D.输卵管
E.腹腔
参考答案：D
He turned down the request of his friend because it was the limit of his power.
A．beyond
B．over
C．off
D．above
A．分子间无间隙
B．分子间的无规则运动减弱
C．分子间存在着斥力
D．分子间的引力作用
