肝阴虚之虚劳治宜（）
A．沙参麦冬汤
B．益胃汤
C．左归丸
D．补肝汤
E．补肺汤
参考答案：D
— The floor is too dirty.
— I know. It _______ for weeks.
A．hasn’t cleaned
B．didn’t clean
C．hasn’t been cleaned
D．wasn’t cleaned
气焊气割的气体有（）.
A、乙炔
B、空气
C、氧气
D、氢气
E、液化石油气
