①——What day is it tomorrow?

②— It's Saturday. What are you going to do?（指出这三个句子在一般情况下应该用什么语调。）

③—Nothing much.

A、①升调②降调③降调

B、①降调②升调③降调

C、①降调②降调③升调

D、①降调②降调③降调