题目

补全对话。选用方框中所给句子完成对话，有一句是多余的。 A: Hello! May I speak to Bill? B: Speaking! A: Hi, Bill! This is Jane speaking. B: Hello!   1  A: I called you yesterday, but nobody answered the telephone.   2     B: I went to the World on Water (水上世界) with my parents. A: Really?   3   . B: It was great. We saw the dolphin show (海豚表演). It was very wonderful. A: That sounds interesting. B:   4   . A: Oh, the day after tomorrow will be my birthday.   5   B: Yes, I'd love to. Thanks a lot. A: You're welcome. 1.________ 2.请用化学知识解释下列问题：（1）某同学做硫在氧气中燃烧实验时，预先在集气瓶中装少量氢氧化钠溶液．你认为他的目的是什么？（2）炒菜时，油锅着火，用锅盖盖灭或把菜倒入锅中灭火，其灭火的主要原理分别是什么？（3）为什么空气比水更容易被压缩？