Everyone here will thank the firefighters for the things they have done to prevent fires _______ the environment safer.

A．make

B．to making 

C．to make

D．from making

日常生活中，天气预报描述的两个基本要素是（　　）

A．气压和风

B．气温和降水

C．气压和湿度

D．空气质量和风