与流入小肠壁内的血液相比，流出小肠壁的血液中所含成分的特点是[ ]
A．氧增加了
B．二氧化碳减少了
C．养料增多了
D．废物减少了
答案：C
David visited lots of in the world. [ ]
A. places of interesting
B. places of interest
C. place of interests
D. place of interesting
朱砂安神丸中配伍黄连的意义是
A．泻火解毒B．清热燥湿C．清胃泻火D．清热解毒E．清心泻火
