题目内容：

以下每组对话由三个句子组成，指出这三个句子在一般情况下应该用什么语调。

1.--You lost your bike,didn’t you?

--Yes,I lost it yesterday

--What a pity!

A.升调，降调，降调        B.降调，升调，降调

C.降调，降调， 升调       D.降调，降调，降调

2.--Tom, can you play the piano?

--No, I can’t.

--Then ,what can you do?

A.升调，降调，降调        B.降调，升调，降调

C.降调，降调，升调，      D.降调，降调，降调