翻译语篇 阅读下面的短文．将文中划线部分的句子做相应的英、汉互译。

　　 The students were having their chemistry class. 66. Miss Li was telling the students what water was like. After that, she asked her students, "What's water?" No one answered. A few minutes later, Miss Li asked again, “67. 你们为什么不回答我的问题? Didn't I tell you what water was like? ”

　　 Just then a student put up his hand and said, "Miss Li, you told us that water has no color and no smell. However, where to find such kind of water? The water in the river behind my house is always black, and it has a bad smell" 68.大多数学生同意他的意见。

　　 “I'm sorry, children?” said the teacher, 69. "Our water is getting dirtier and dirtier.

That's a problem. 70. We should do what we can to make the world cleaner."

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书面表达

于老师给大家一个机会写一封信给她提提建议。假设你是于老师的学生，给她写一封信。例如上课录音机（recorder）的声音小、上课接电话、作业多、到办公室找不到老师等等。

Dear Miss Yu,