— It's late now. We must go back to the ________.— Yes. I really need a good sleep.
A:hospital
B:supermarket
C:theatre
D: hotel
我们从外界获取的信息中,大多是来自( )
鸦片战争后中国社会逐步沦为( )
若一个代数式a2-2a-2的值为3,则3a2-6a的值为( )