乌拉尔山、乌拉尔河两侧的大洲是( )
A:亚洲、非洲
B:北美洲、南美洲
C:亚洲、北美洲
D:亚洲、欧洲
— Bob, shall we go and meet our new classmate?
— Sorry, I'm busy now. But you ________ ask David to go with you. He is free.
复数2-i31-2i= ( )