抛物线$y=x^2-2x-3$的对称轴是(      )          

    Spring Festival is our Chinese people's festival. There are twelve names. We call it the year of sheep, the year of dog… and the year of monkey. Before the day of the festival, people are very busy(忙于 ) shopping and cleaning their houses. On the Eve, there is a big family dinner. After dinner, all the family stay up late( 守夜 ) to welcome the new year. It is the middle of the night. We have some dumplings and watch many good TV programs( 节目). On the first day of the New Year, people wear their new clothes to go to their friends' houses. They say “ Happy Spring Festival” to each other. Children will get some money from their parents or other people. So people especially( 特别) children like Spring Festival very much.

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随着改革开放的不断深入，城乡社会生活发生了巨大的变化。“跳槽”“炒鱿鱼”“创客”等新鲜词汇频繁出现，这实际上反映了（    ）