婴幼儿轻度腹泻,一天内大便次数比平日增多,但少于()次。
A.5
C.10
C.15
D.20
参考答案:C
— _____ do you learn English?
— By listening to tapes and reading aloud.
A.How
B.Why
C.Whose
D.When
酒店前台发票作废时();电话费属于()。