人民代表大会制度是中国特色社会主义制度的重要组成部分，也是支撑中国国家治理体系和治理能力的根本政治制度。这一制度的基本内容包括(　　)

①全国人大在我国的国家机构中居于最高地位

②人民通过选举选出代表组成国家权力机关

③国家权力机关由其他机关产生并依法行使职权

④实行民主集中制的组织和活动原则

短文改错

    My swimming experience is extreme interesting. There was a time when I swim like a rock.This went on till one day when I was fishing with a friend of mine at nearby pond. I was so much careless that I slipped into one. Had my friend not come to my rescue, I would have be drowned. Ever since then, I have come to know the importance of learn to swim. I didn't go to any training class but  learned it all by me. Now I have no difficult swimming at all . Though the way I swim looks clumsy ,at least it can keep me floating. Thinking of this, I feel quite satisfying.