In this section, we will briefly describe possible ways of reducing the costs and risks ______ in doing this.

A．involving

B．involved

C．to involve

D．being involved

下面哪种药物能用于治疗胃溃疡（）

A、奥美拉唑

B、地塞米松

C、阿司匹林

D、吲哚美辛