题目

 A、B、C三种物质的混合物各15g，它们发生化合反应时，生成30g新物质D．若增加10g C，A与C恰好完全反应，则A与B参加反应的质量比为（ ） A．1：1 B．2：1 C．2：3 D．3：2 答案：D根据句意及汉语提示填写单词。【1】We can clearly see fish swimming at the______(底部) of the river.【2】The girl seldom goes outside because of an_____(难看的) scar on her face.【3】The fewer_____(塑料的) bags we use，the more beautiful our earth will be.【4】The villagers used to burn ______(煤) to get warm.【5】Don't _____(乱扔) waste things everywhere.