题目

补充对话A. He is playing soccer on the playground.B. Are you watching TV?C. Do you like the school library?D. I like playing basketball best.E. How about you?F. Would you like to play basketball?G. Because I love reading booksA: Hello, LiLei! What are you doing now?B: Guess!A: B: Yes, I am. A: I'm doing my homework. And I'm going to the school library soon.B: A: Yes, I like the school library best.B: Why?A: What do you like doing best?B: I think it's good for health.7．下列关于离子化合物的叙述正确的是（　　）A．离子化合物中的阳离子只能是金属离子B．离子化合物中一定含有离子键C．离子化合物都能溶于水，其水溶液可以导电D．溶于水可以导电的化合物一定是离子化合物