1. Presentation of the preview 预习成果展示

2. Explanation and discussion 答疑讨论

3. Classroom learning tasks 课堂学习探究任务

1. ordinary adj. 普通的，平常的，通常的 ( not different or special)

I thought the paintings were pretty ordinary.

我认为这些画是泛泛之作。

拓展： out of ordinary 不寻常的，例外的 adv，ordinarily 通常 (usually)

区别：common, ordinary, normal

common 用于物，指不稀奇，很普通，无异常的特征。

用于人，指很平凡，没职位，不高贵。

Pine trees are common throughout the world.松树在世界各处都很常见。

He is not an officer, but a common soldier.他不是军官，而是个普通士兵。

　normal 指正常的， 反义词：abnormal 不正常的

　The average temperature this spring is below normal.

　今年春天平均气温比正常偏低。

　ordinary 指日常生活随时碰到的，平凡的，平常的,

　the way of life of the ordinary people 普通人的生活方式

用common, ordinary 或normal 填空:

(1) the ____________ people 老百姓 (2) __________ knowledge 常识

(3) Train services were back to _____________ soon after the accident.

(4) In the west it's becoming quite _____________ for couples to divorce（离婚）.

(5) Nothing out of ______________ had happened.

2. unique

adj. 独一无二的，独特的 (being the only one of its kind)

Each person's fingerprints are unique. 每个人的指纹都是不同的。

adj. 极好的，难得的，特别的 (informal usually good and special)

a unique opportunity to travel. 难得的旅行机会

拓展： adv. uniquely n. uniqueness

词语辨析： unique, only, single

unique：表独有的，特有的，强调独特，在单数名词前常用修辞。