下面史实能够说明大清王朝出现社会危机的是（  ）

修改病句

实施素质教育后，我们课外阅读的数量和质量都明显提高了。

60年来，一代代航天人艰苦奋斗、自强不息、不断创新、勇于拼搏，取得了以“两弹一星”、载人航天工程和月球探测工程三大里程碑为代表的辉煌成就，他们把青春、智慧和汗水奉献给了祖国的航天事业。从事航天事业要（    ）

①把正确的价值导向作为航天事业的根本出发点

②以人民的利益和国家领导人的认可作为的评价标准

③具有高深的学识水平、非凡的工作能力和艰苦奋斗的精神

④正确处理个人兴趣爱好与国家民族要求的关系

      Traffic lights are very important for us. I think you know this. But do you know how they were born?
      Garrett A. Morgan was the father of traffic lights. He was an American. His family was very poor. He left school at the age of 14. He was clever. He always looked for better ways to do things. And he liked to make new things.
      At that time, every American wanted to have a car. The streets were full of cars. The traffic was really bad. “Why not put three lights at each corner ? They should be red_,green_,and yellow，” Morgan said , “ Let them tell cars to go or stop.” He made a timer (定时器)to change the lights.
     So we have traffic lights today .