A:12
B:23
C:32
D:43
下列关于文学作品的表述正确的一项是( )
中国1978年底以后的经济改革获得了成功,而苏联赫鲁晓夫、勃列日涅夫和戈尔巴乔夫的经济改革最终都没有成功,其主要原因是( )
do lunch like have get go favorite interesting relaxing boring
Tom ____ up at 6:30 every morning and he ____ to school at 7:40. He ____ math at 8:30 and science at 9:30. English is his ____ subject. He ____ it because it's really ____. Mr. Green is his math teacher. He has ____ at 12:00 at school. His music and P.E. classes are often in the afternoon. They are ____. But he ____ not like history, because it's ____. He has seven classes on Monday, Tuesday and Thursday. He has six classes on Wednesday and Friday.
①A试管中产生的气体是____,B试管中产生的气体是____,由此证明电解水时发生了____变化,该变化的文字表达式为____,基本反应类型是____.
②已知化学变化前后元素种类不变,那么由此实验可得出水是由____组成的.