——How was your summer camp, Ben? ——________. I made so many friends.
A:Of course
B:Not really
C:Boring
D:Fantastic
“北京时间”是采用北京所在的 ( )
南极地区气候严寒的主要原因是
已知函数f(x)=|x|+ mx ﹣1(x≠0)