ExercisesContentsDownloadsUNIT 18: POLLUTION AND HOW TO STOP IT 污染与治理Question 1 / 21请完成全部题目,最后查看答案与解析VOCABULARY · B1 Exercise 1 · Exercise 1Choose the correct option for each gap.The children spent the morning picking up _____ in the park.Arenewable energyBsmogClandfillDlitter保存并进入下一题 →