0.02×0.5的积是三位小数得0.001

如图，抛物线y=﹣x²+bx+c经过A（﹣1，0），B（3，0）两点，且与y轴交于点C，点D是抛物线的顶点，抛物线的对称轴DE交x轴于点E，连接BD．

***思想在中国革命与建设时期不断发展。下列各项按时间先后顺序排列正确的是（    ）

①“星星之火，可以燎原”

②“抗日战争是持久战，最后胜利是中国的”

③“***领导的中国革命运动，包括民主主义革命和社会主义革命两个阶段 

④“在我们的面前有两类社会矛盾，这就是敌我之间的矛盾和人民内部矛盾……”

    Last year, my best friend, Li Xiaoming, talked about the best way of studying English. At first he thought the teacher spoke 1quickly2he didn't understand. He also3 ask questions4 his poor pronunciation. Then he began to watch English movies, he 5 funny movies.6 he couldn't understand everything the characters said,7he can get the meaning by watch body language and expressions. He also realized he could get the meaning by8 for the key words. His pronunciation improved as well by listening to the conversations in English movies. Sometimes he learned some9sentences like “It's a piece of cake.” At last he often 10 the new words in the dictionary.