志愿者在对患者进行填塞止血法时，不能填塞患者哪个部位？（）
A.双臂
B.头部
C.双手
D.双腿
参考答案：B
Living in the mountain area has its problems , _____ obtaining water is a big problem.
A．of which
B．for what
C．as
D．whose
消费者剩余
