Most of us know we should cut down on fat, but knowing such things isn't much help when

it ____ shopping and eating. [ ]

A. refers to

B. speaks of

C. focuses on

D. comes to

下列属于熔化焊接范畴的有（）

A、二氧化碳气体保护焊

B、气焊

C、焊条电弧焊

D、爆炸焊