BBS不能用来（）。
A、发表自己的观点
B、与人讨论问题
C、看电影
D、聊天
参考答案：C
确诊骨质疏松需测定的是（）
A.峰质骨量
B.钙
C.骨矿密度
D.X线
E.BMC
Mr Zhang _______ his cap and sat down as soon as he entered the room. [ ]
A. took off
B. took out
C. took away
D. took down
