With that trust ____ to serve all Americans and I will do my best to fulfill that duty every day as your President.

A．coming a duty

B．which comes a duty

C．comes a duty

D．a duty came

实验人员在进行动物实验时，必须以正确和适宜的方式抓取动物，禁止对动物采取突然、（）的抓取方法。

A.快速

B.简单

C.粗暴

D.灵活