—You'd better remember what I said yesterday,             others will laugh at you.

－Sure. I'll do it            you told me. [ ]

A. or; as

B. and; as

C. or; after

D. and; after

如图是制备和收集气体的实验装置，该装置可用于（ ）

A．浓硝酸与铜反应制取二氧化氮

B．过氧化氢与二氧化锰反应制取氧气

C．浓氨水和生石灰反应制取氨气

D．浓盐酸和二氧化锰反应制取氯气