________ English will help to communicate _____ people fromdifferent countries in the world. A. Known; with B. Knowing; with C. To know; to D.To know; in 答案:BKnowing English为动名词作主语,泛指“通晓英语”。communicate with sb.意为“与某人交往”。 用化学用语填空(1)标出过氧化氢中氧元素的化合价 (2)碘酒在医疗上常用来消炎,其溶剂是 (3)地壳中含量最多的金属元素和最多的非金属元素组成的物质 (4)写出符号中“2”的含义:Ca2+ (5)氯化铁中的阳离子 .