My postcard is still on the desk. Why （）you （）it

A．haven't; posted

B．didn't; post

C．wasn't; posting

D．won't; post

具有温脾开胃摄唾、暖肾固精缩尿作用的药物是（）

A.益智仁

B.补骨脂

C.杜仲

D.蛤蚧

E.冬虫夏草