题干
- Can Kitty fly?
-
A：No, he can't.
B：Yes, she is.
C：No, she can't.
答案(点此获取答案解析）
C
-
A：No, he can't.
B：Yes, she is.
C：No, she can't.
，
的夹角为
，且
，则向量
的夹角等于（ ）.