洪涝地区的灾民用下列几个步骤将河水转化为可饮用水．①化学沉降（用明矾），②消毒杀菌（用漂白粉），③自然沉降，④加热煮沸．以上处理过程顺序合理的是（   ）

西部地区可开发的水能资源占全国的72%，已探明的煤炭保有储量占全国的39%，下图是西电东送示意图，据图回答问题。

西电东送是指西部地区的水电和火电输往东部，图中有火电站分布的是（   ）

下列各组图形中，一定是全等图形的是（   ）

阅读理解
    Dogs are people's friends. They will do anything their masters (主人) ask them to do and they do their duty very well.
    Curly is my black dog. He is big and strong. He is strong enough to carry me on his1 . He likes running and playing with me. He likes to 2my father around in the fields, too.
   One day my father took off his coat. Put it on the ground 3  a big tree and said to Curly. “  4  my coat.”
Curly sat down on the coat. Then my father remembered he had to5dinner for the family.   6 he went home and forgot all about his coat and dog.  
    Late in the evening I 7 my dog and looked for him everywhere in the yard. I called, "Curly, Curly!" But Curly did not answer.
Soon my father wanted something in his coat pocket (口袋). Suddenly he remembered8  he had done. Quickly he went back to the big tree. What do you think he saw? Curly was 9 sitting on the coat! He was afraid someone would take it10 .

1个铀235吸收1个中子发生核反应时，大约放出196 MeV的能量，则235 g纯铀235完全发生核反应放出的能量为（NA为阿伏加德罗常数）（    ）