The style of writing in this article is so beautiful, which made the reader please both to the eye and in the mind.

A．pleases the reader

B．please made the reader

C．pleased the reader

D．made the reader pleasant

催化剂撇头过程中，如发现器内催化剂发生自燃，应立刻（）。

A、向器内喷水

B、向器内投入大量干冰

C、床层通大量氮气

D、通入大量蒸汽