急性阑尾炎腹痛起始于脐周或上腹的机制是：（）
A.胃肠功能紊乱
B.内脏神经反射
C.躯体神经反射
D.阑尾位置不固定
E.阑尾管壁痉挛
参考答案：C
么叫用水定额？
When father was young, he（）from morning till night.
A.was made work
B.was made working
C.made to work
D.was made to work
