题目

下列有关滴定操作的顺序正确的是：①用标准溶液润洗滴定管；②往滴定管内注入标准溶液；③检查滴定管是否漏水；④滴定；⑤洗涤（ ）A. ③⑤①②④ B. ⑤①②③④ C. ⑤②③①④ D. ②①③⑤④ 答案：【答案】A【解析】中和滴定有检漏、洗涤、润洗、注液、滴定等操作，中和滴定顺序为③检查滴定管是否漏水、⑤洗涤，①标准溶液润洗滴定管、②往滴定管中注入标准溶液、调整滴定管中液面在“0”或“0”以下刻度、记数，④滴定，则正确的滴定顺序为③⑤①②④，故答案A正确。故选A。任务型阅读理解(共计5分，每题1分)Here is something about the America students. In America each student works as hard as he or she wants in high school. If they don’t work hard enough to get good grades, they will not pass. If they fail, they may not get into the college（大学）they want to. However（然而）, in high school you have more time to do things than in college. Many students take part in hobby groups. Other students go in for sports such as football, baseball or basketball. Nearly（几乎）all high schools have sports teams. Also students usually get their first job when they are in high school, though（尽管） the jobs aren’t very good. For example, a lot of students work at fast-food restaurants. In American high schools, fashion（时尚）seems very important. If you don’t have the newest and coolest clothes as those children who certainly already have them, they will think you are not cool.1.Is fashion important in American high schools?______________________________________________________________2.请将文中划线的句子译成中文：______________________________________________________________3.What can students in high school do in their free time?______________________________________________________________4.找出文中与下面句子意思相近的句子：In American high school, if you don’t have fashionable clothes, the others who have them may laugh at you.______________________________________________________________5.When does children usually get their first job?______________________________________________________________