— How much of his speech do you think you have understood?

—________. I wish I had worked harder.

A．Quite a few

B．Very few

C．Next to nothing

D．Quite a lot

关于孕激素的生理作用，正确的是（）

A.促使并维持女性第二性征的出现

B.使子宫内膜发生分泌期变化

C.使子宫内膜发生增生期变化

D.促进子宫收缩

E.降低血浆低密度脂蛋白含量