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）
7. A) She was watering flowers. B) She was reading books.
C) She was talking to the girl. D) She was doing housework.
8. A) John. B) Alice C) Mike D) Mary
9. A) By train B) By plane C) By ship D) By car
10. A) At home B) In the hospital C) In the school D) At the supermarket
11. A) Every day B) Once a week C) Twice a week D) Once a month
12. A) More sandstorms B) Less Pollution
C) Planting more trees D) Cutting down fewer trees
