Thank you for ________ CCTV's Around The World show.
A:join
B:is joining
C:to join
D:joining
已知| a→ |=1,| b→ |=2,| a→ ﹣ b→ |= 5 ,则 a→ 与 b→ 的夹角为( )
There are some____(香肠)on the table.
把108700“四舍五入”到万位.____