消化道溃疡最常见的症状是（）
A.腹胀
B.呕吐
C.便血
D.恶心
E.上腹痛
参考答案：E
The enemies _______ the village and it was burnt_________the ground. [ ]
A. set fire to; on
B. burn; on
C. set fire to; to
D. set on fire; to
简述轧辊打毛的目的及作用。
