He doesn't like English          Chinese,but he likes maths.[ ]

A.and

B.or

C.too

D.with

学龄期儿童患消化性溃疡的最主要临床表现是（）

A.反复腹痛

B.反复呕吐

C.便秘

D.反酸、嗳气

E.血便