题目

已知平面向量，满足（+）=5，且||=2，||=1，则向量与的夹角为（ ） A．    B．    C．  D． 答案：B．After staying in hospital for long, the patient was advised to go to the seaside to ______ his health.A．take up              B．pick up        C．make up         D．hold up