B.Listen to the dialogue and choose the best answer to the question you hear (根据你听到的对话和问题，选出最恰当的答案)：(8分)
7. A）15 B）18 C) 21 D) 33
8. A) Surprised B) Happy C) Worried D) Excited
9. A）Kitty B) Gary C) Mike D) Mary
10. A) A student B) A manager C) A worker D) A math teacher
11. A) Shanghai B) Beijing C) Korea D) Thailand
