家兔受精卵在母体内发育成胚胎的场所是 [ ]
A. * *
B.子宫
C.胎盘
D.输卵管
答案:B
The old man always________ the clothes from ________century.
A.puts on, the twenties
B.has, twenties
C.dresses, the twentieth
D.wears, the twentieth
机坪隔离区场内驾驶的司机需要取得机场交警大队颁发的什么资格证书?()
A.场内驾驶证
B.一般通用驾驶证
C.工程部授权证书
D.车队授权证书