吗啡不引起下列哪种不良反应（）
A.恶心、呕吐
B.腹泻
C.呼吸抑制
D.体位性低血压
E.排尿困难
参考答案：B
填表：比较我国长城站和中山站的位置差异。
She is _____ than he is. [ ]
A. much more outgoing
B. much outgoing
C. very outgoing
D. as outgoing
