It’s quite obvious that the aging population in China will cause _____heavy pressure on _____whole society in the future.

A．/, the

B．the, /

C．a, the

D．a, a

人工流产后发生闭经应首先考虑是什么性质的闭经

A．垂体性闭经

B．卵巢性闭经

C．中枢性闭经

D．下丘脑性闭经

E．子宫性闭经