资源简介
（友情提示：鼠标拖选单词即时翻译）
Ⅰ.Teaching aims and demands：
1.Topic: Talk about science and scientists
2. Function: describing people and debating
That’s correct. It’s clear that… I doubt that … There is no doubt that…
It’s hard to say. Well, maybe, but… That’s true.
What’s your idea? Have you thought about…?