—Do you think it is hard for you to learn math well?

—Yes. I really want to drop it.

A．go on learning well

B．pick it up

C．give it up

D．work hard at it

前列腺增生症， * * 可能发生的形态改变是()

A． * * 内口移位

B．后 * * 拉长超过3cm

C．后 * * 曲度改变

D．排尿期 * * 腔变细或不规则

E．以上均是