题干
He is kind and always _______ his help to others.
A：receive
B：bring
C：take
D：offer
答案(点此获取答案解析）
B
A：receive
B：bring
C：take
D：offer
，且
与
垂直，
垂直，
与
的夹角的余弦值为（ ）
do my h