嗳气多因
A．脾气虚弱
B．胃气上逆
C．肺失宣降
D．肝气郁结
参考答案：B
22. —Mr. Smith _____ in Russia for 10 years.
—No wonder he can speak Russian fluently and now teaches Russian in a Chinese college.
had stayed B. has stayed C. stayed D. stays
实际装有货物并具有货票的货车是（）。
A、待卸车
B、重车
C、装车
D、运用车
