After the company reformed its rules and regulations, we find the business is really ________.

A．taking off

B．bringing in

C．knocking off

D．taking up

恶性胃溃疡具有的征象是（）

A.放射状黏膜纠集

B.腔外龛影

C.黏膜杵样中断

D.环堤

E.胃壁蠕动消失