题目

“苛性钠、烧碱、纯碱、火碱”四种俗称中所代表的物质只有( )。 A. 1种  B. 2种 C. 3种  D. 4种 答案：B根据图片提示完成对话。A: How do you go to ______________ ?B: My home is near. Usually I go to school ______________ . Sometimes I     go ______________ . What about you?A: I usually go to school ______________ .