物质的用途错误的是( ) A. 稀有气体制作电光源 B. 二氧化碳制作碳酸饮料 C. 氧气作燃料 D. 氧化钙作干燥剂 答案:C给下列句子找答案。( )1. Are you OK? A This is Ben. He’s from Canada.( )2. Who’s that girl? B Oh, that girl is Angela.( )3. Who is this boy? C I’m Ok. Thank you!( )4. Good-bye! D Hi!( )5. Hello! E Bye-Bye!