下述对改善睡眠呼吸暂停综合征无效的是（）
A.戒烟酒
B.控制体重
C.睡眠时仰卧位
D.勿服安眠药
E.睡前勿饱食及饮酒
参考答案：C
His sister left home in 1998，and_______since．
A．had not been heard of
B．has not been heard of
C．had not heard of
D．has not heard of
砂淋，首选（ ）
A．车前子
B．木通
C．滑石
D．金钱草
