-Which would you like, a cup of tea or a glass of milk?- ______. I think I'll just have a glass of water.
A: Both
B:Neither
C:None
D:Either
已知 a→ 与 b→ 的夹角为 π3 ,其中| a→ |=2,| a→ ﹣2 b→ |=2,则| a→ + b→ |=( )
____