题目

 ---What do you think of the music teacher?   --- __________ she is an elegant lady, she can be extremely difficult to work with.   A. When           B. While            C. Even if             D. As 答案：B下列实验技能都是你必须具备的，你能作出正确回答吗？（1）如何判断玻璃仪器已经洗涤干净？    ．（2）加热氯酸钾制氧气，用排水法收集，何时开始？    ．（3）洒出的酒精在桌上燃烧起来，如何处理？    ．