题目

a single world can change the meaning of a sentence, a single sentence can change the meaning of a paragraph. A . Just as B . Even though C . Until D . Unless 答案：A下列实验操作或事故处理正确的是 A．实验结束后，用嘴吹灭酒精灯 B．把水加入到浓硫酸中来配置稀硫酸 C．金属Na着火，立即用水扑灭 D．实验桌上的酒精灯倾倒了燃烧起来，马上用湿布扑灭