坐位前倾时，可使哪种杂音更明显
A．二尖瓣狭窄B．二尖瓣关闭不全C．主动脉瓣狭窄D．主动脉瓣关闭不全E．肺动脉瓣狭窄
参考答案：D
能反映肝内或肝外胆汁淤积的试验是（）
A.血清总胆红素和直接胆红素
B.血清总胆汁酸
C.血清ALP及其同工酶
D.血清GGT
E.血清总胆固醇定量
My mother is at work. I have to my grandma at home.[ ]
A. look out
B. look up
C. look after
D. look around
