题目

实验室中,现有下列物质:①氯水 ②盐酸 ③浓硝酸 ④氢氧化钠 ⑤硝酸银,其中必须保存在棕色试剂瓶中的是 【    】 A.①③⑤        B. ①②④       C.①②         D.全部 答案：A . If I ______ plan to do anything I want to，I’d like to go to Tibet and travel through as much of it as possible. A. would                  B. could            C. had to                  D. ought to