小儿胃食管返流的最常见症状是（）
A.反酸
B.烧心
C.呕血和便血
D.咽下疼痛
E.反复呕吐
参考答案：E
—What do you think of their marriage?
—______, if I were Kate, I would not marry him.
A．Generally speaking
B．I have no idea
C．To be honest
D．To my surprise
怎样礼貌地向别人提出请求？
