Everyone has his or her advantages, and only _______ you do best can help to reach the goal and truly make a difference.

A．discovering what

B．discovering whose

C．by discovering what　

D．by discovering which

田护士给大学生讲解女性保健常识

女性 * * 的防御功能常指的是（）。

A.避免意外受孕

B.防止异物进入

C.自净作用

D.减少肿瘤发生

E.缓冲外力撞击