脐疝的发病原因是
A.一种发育缺陷
B.腹壁外伤
C.患儿缺钙
D.脐部感染
E.腹压升高
参考答案:A
I can't _____ any good advice to give her. [ ]
A. think for
B. think of
C. think up
D. think over
优质服务的核心内容为()。
A.礼貌服务
B.真诚待人
C.礼貌待客
D.尊重旅游者