胸腔积液的患者喜卧于病侧的原因是（）。
A.减轻肺脏压迫
B.减轻疼痛
C.增强健侧肺的呼吸运动
D.促进积液吸收
E.以上都对
参考答案：A, B, C
34. It is fairly common in Africa for _______ a group of musicians surrounded by others who also join in the performances.
A．there are
B．there being
C．there to be
D．there be
第二代抗组胺药的特点有（）
A.半衰期长
B.作用更特异
C.容易透过血脑脊液屏障
D.有较强的抗胆碱能作用
E.服用方便
