声音简介
Grammar focus
What are you doing？ I'm watching TV.
What's she doing？ She's washing her clothes.
What are they doing？ They are listening to a CD.
Are you doing your homework？ Yes，I am./No，I'm not. I'm cleaning my room.
Is he reading a newspaper? Yes，he is./No，he isn't. He's playing basketball.
Are they using the computer? Yes，they are./No，they aren't. They are exercising.
She's exercising(now).
She exercises(on Mondays/every night/in the mornings/etc).
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