topic 2: what has happened to the population?
topic 3: the world has changed for the better.
exam: two periods。
unit 2: saving the world. (fifteen periods)
topic 1: there are many kinds of pollution around us.
topic 2: none of us likes pollution.
topic 3:how green are you?
review of units 1-2 (two periods)
exam: two periods
unit 3: english around the world. (fifteen periods)
topic 1: english is widely spoken around the world.
topic 2: can you speak more slowly, please?
topic 3: i don’t know how to remember new words. 內容來自dedecms
exam: two periods。
unit 4: magical science. (fifteen periods)
topic 1: fantastic trip!
topic 2: when was it made?
topic 3: perhaps people will fly to mars.
review of units 1-4 (two periods)