句型转换。

1. They're having a music class. (就划线部分提问)

     _______ class _______ they having?

2. It's Friday today. (同上)

    _______ _______ is it today?

3. We play the piano twice a week. (同上)

     _______ _______ do you play the piano?

4. He usually goes to Beijing by sea. (同上)

    _______ _______ he usually go to Beijing?

5. I don't like this motorcycle because it's too old. (同上)

    _______ _______ you like this motorcycle?

某一市民发现公共汽车费上涨了5毛钱，他仍然照常乘车，这表明公共汽车服务的需求价格弹性接近于零。