—I think students should have mobile phones to call their parents.
— . They often use them to play games instead.
A:I hope so
B:I don't agree
C:Good idea
20世纪二三十年代,面对国内的经济和政治危机,没有走上法西斯道路的国家是( )
如图所示年代尺中提供的时间,解读最准确的是( )
设a=logπ3,b=20.3,c=log3sinπ6,则( )