题目内容：

以下每组句子由句子组成，指出这三个句子在一般情况下应用什么语调？

1.①--Are they cleaning the classroom ?

②—No, they aren’t .

③—What are they doing  then.

A.① 升调 ② 降调 ③ 升调       B.① 升调 ② 升调 ③ 升调

C.① 升调 ② 升调  ③ 降调      D.① 升调 ② 降调 ③ 降调

2.①-I beg your pardon, sir ?

②— I want some medicine for my mother .

③—For your mother ?

A.① 升调 ② 降调 ③ 升调       B.① 降调 ② 升调 ③ 降调

C.① 降调 ② 降调  ③ 降调      D.① 降调 ② 降调 ③ 升调