题目

阅读下列四篇短文，从每小题后所给的A、B、C、D四个选项中，选出最佳选项，并在答题卡上将该选项涂黑。Dear Editor, I'm a Senior 1 student in a middle school. This term, my favourite teacher, Miss Mao, no longer teaches us. I want to see her, but I'm afraid that she no longer likes me and I don't want to trouble her. I really miss her. What should I do? Tian Yan Dear Tian Yan, It's bad luck that you have lost your favourite teacher. But, if she is still in your school, nothing can stop you going to see her. When she isn't busy, ask he某同学梳理以下知识：①能改变化学反应速率，而本身的质量和性质在反应前后都不变的物质叫做催化剂。②中国芯的芯片基材主要是高纯硅，硅由分子构成。③洗洁精能清除餐具上的油污，是利用它的乳化作用。④点燃氢气等可燃气体前，均先检验气体的纯度。⑤溶液都是均一、透明的液体。⑥用酒精浸泡捣烂的某些植物的花瓣可制酸碱指示剂。其中正确的个数有（　　）A. 1 B. 2 C. 3 D. 4