It was a great trip, ______ we didn't enjoy it ______ the beginning. [ ]

A. and; in

B. or; at

C. so; at

D. but; at

雾中在航机动船对水移动时应鸣放一长声，这里指的机动船是指（）

A.任何用机器推进的船舶

B.除操限船、从事捕鱼的船舶和失控船以外的任何机动船

C.A、B均对

D.A、B均不对