资源看点：涵盖整个第一单元内容。特点：设置了场景来练习条件状语从句。

Daming:How does a  CD recorder work?

Tony:let’s look at the instructions.“If you want to  turn      on ,press the blue button.If you  want to play           back,press the green button.”
Daming:You’ve done that.
Tony:“ If you want to record,press the red button.If  the      red light doesn’t come on,wait for thirty seconds.”
Damng:Ok,Let’s try.
Tony:Is it working?
Daming:Yes,it is.“If you want to send your recording
by email,connect it to your computer.If there’s no         green light,choose the 〝copy〞symbol.”
Tony:Come on.Press ‘‘record’’to start our programme.