首选的检查手段是
A．腹部X线平片
B．腹部CT
C．腹部B超
D．腹腔穿刺
E．急诊胃镜
参考答案：A
面色萎黄、少气懒言、疲乏无力等症可由哪项导致（）
A.气滞血瘀
B.气不摄血
C.气随血脱
D.气血两虚
E.气血不荣经脉
— What are the boys doing?
— They _______________ in the boat. [ ]
A. sitting
B. are sitting
C. sit
