—Water had got into it,and it was completely .
A:ugly
B:smelly
C:useless
D:fluent
——Last month I traveled across the Sahara Desert by ______ camel with some locals. ——What ________ amazing experience!
在△ABC中,∠C=90°,tanA=3,求cosB.
不是我国四大工业基地的是( )