The president spoke at the business meeting for nearly an hour without _________ his notes.

A．bringing up

B．referring to

C．reacting to

D．trying on

急性阑尾炎早期脐周或上腹疼痛的原因是（）。

A.胃肠功能紊乱

B.内脏神经反射

C.躯体神经反射

D.阑尾位置变动

E.阑尾管壁充血