题干
—_____ do you like the sunglasses?
—They're pretty.
A：What
B：How
C：How much
答案(点此获取答案解析）
B
—_____ do you like the sunglasses?
—They're pretty.
A：What
B：How
C：How much
，
的夹角为
，且
，则向量
的夹角等于（ ）.
