解分式方程：$\frac{3}{x^2-9}$﹣$\frac{x}{3-x}$=1．

根据汉语拼音写出汉字。

①chán chán____ 流水     ②水上lián yī____ 。

③枯叶sù sù ____        ④黑黑的kē dǒu ____。

500mL KNO₃和Cu(NO₃)₂的混合溶液中c(NO₃^－)＝6.0 mol·L^－1，用石墨作电极电解此溶液，当通电一段时间后，两极均收集到22.4 L气体（标准状况），假定电解后溶液体积仍为500 mL，下列说法正确的是（   ） 

Every great achievement has been the result of years of dreaming. Even in early times, people could realize the  1 of dreams. If a person has a dream and works hard, he or she will find a way 2 bring it into success.

Children do not have  3  knowledge. However, they are natural dreamers. We should not  4  them. With their rich imagination, they will  5  with fantastic dreams. History is   6of examples. Many great men were dreamers when they were children. One such dreamer was Thomas Edison. He used to 7  ostracized(排斥) when he was in primary school, but his achievements were greater than  8   in his time.

 Teenagers and young people should also be  9to dream. They had big dreams and their dreams 10their lives and even the world. Steve Jobs and Bill Gates are the good examples. They  11   developed technology and brought great progress to humans besides making money for   12 .

 Older people should believe that it is never 13  late to dream. Colonel Saunders  14  KFC at the age of 67. Everyone has a chance to make dreams15 .