19. I made a bad impression ________ the teacher ________ arriving late on my first day.

    We are learning English, but how can we learn English well? A student can know a lot about English, but maybe he can not speak English.
If you want to know how to swim, you must get into the river. And if you want to be a football player, you must play football. So , you see, you can learn English only by using it. You listen to your teacher carefully in class. You must read your lessons every day. You must speak English to your English teacher and classmates and also you must write in English. Then one day, you may find your English very good.

下列物质属于纯净物的是（）

依次填入下面一段文字横线处的语句，衔接最恰当的一组是(　　)
中国现代散文发端于伟大的新文化运动。________。
①郁达夫曾说：“‘五四运动’的最大的成功，第一要算‘个人’的发现。”
②散文的写作从此变得面貌一新
③现代散文石破天惊般的辉煌发展与巨大业绩，是继先秦诸子“百家争鸣”之后散文史上又一次思想、文体的大解放、大突破
④由“白话”替代了“文言”，在“文字媒体”的使用上完成了一次全新的转换
⑤由“文章”上升为“文学”，则又极大地提升了散文的“审美品位”
⑥正是这种“发现”，沟通了我国新文学和世界现代文学的精神联系，奠定了“自我”在现代散文中的主体地位，激活了“散文的‘心’”，具有划时代的意义
⑦由“代圣贤立言”变为“表现自己”，又从内容上实现了和世界文学的同步对接

制度创新是历史发展的动力之一，关于以下制度说法正确的是（    ）