从设计规定的研究对象中随机抽出一部分进行调查,称为A．普查 B．队列研究 C．病历对

Do you remember those days       we spent very happily along the seashore last summer?

A．when

B．which

C．where

D．who

火车运输对整车货物的承运前保管责任从填写（）起算。

A.托运单

B.入库单

C.收货证

D.提货证

13. In common ______ other boys of his age, my young son is looking forward to _______ the permission to date.

A． to; be given

B．with; being given

C．like; being given

D．as; be given

胃溃疡的特殊类型有（）

A.穿透性溃疡

B.穿孔性溃疡

C.胼胝性溃疡

D.多发溃疡

E.以上都是

鸡肋事件