一位中学生准备写一篇有关“明清时期君主专制强化对中国社会发展影响”的历史小论文，下列观点中符合这—要求的有(     )
①有利于统一多民族国家的巩固和发展 ②有利于封建经济的发展 ③奠定了中华文明长期领先于世界的基础 ④阻碍了资本主义萌芽的发展

下列词语中，没有错别字的一组是（     ）

增加：在缺词处加一个漏字符号（∧）并在其下面写出该加的词。

删除：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1).每处错误及其修改均仅限一词；

2).只允许修改10处，多者（从第11处起）不计分。

    There was a time when my sister was very sad. She used to be a happy girl but was one of the top student in her class. But she lost her left leg in an accident when she is in high school. She was taken hospital and stayed for a long time. Feel very sad, she shut her in her room and refused to communicate with others. All of us were worried about her. One day she learned about a girl whom didn't lose heart though she lost her leg in an earthquake. My sister was deep moved. She had decided to forget the terrible experience and face her life bravely. Now she is living the happy life.

北京申办冬奥会激发了民众的健身热情．小明不仅爱上了滑冰运动，还用学到的知识对滑冰过程中的一些现象作出以下解释，其中不正确的是（　　）