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( )
根据课文内容填空
Daming has got a____. It ____ walk. And it can dance. One day, hey will do____. They will do the housework. They will help children____. But they____do our homework.
热学知识总结,下列说法中正确的是( )