Karin found some waste paper on the floor. She             it             and threw into the trash can. [ ]

A. put; up

B. picked; up

C. turned; up

D. looked; up

锅炉给水、凝结水和锅炉补给水管道系统应根据锅炉水质要求进行（）。

A.水冲洗

B.化学清洗

C.蒸汽吹洗

D.压缩空气吹洗