题目

根据短文内容和所给中文提示，在空白处写出单词的正确形式，每空限填一词。Parents, especially those of teenagers, care about their children’s education more than anything else. They usually do 【1】 (每件事) for their children. Many of them spend most of their 【2】 (空余的) time helping their children with studies. If they have no time or cannot do it 【3】 (他们自己), they would hire family teachers or send their children to after-class schools. It seems as if a better 【4】 (教育) is all that parents expect for their children.How can we 把盛有碎冰块的大试管插入盛有碎冰的烧杯中，如图所示，用酒精灯对烧杯底部均匀加热。当烧杯中的冰块大部分熔化时，试管中的冰将( )A. 也熔化一部分B. 全部熔化C. 一点儿都没熔化D. 下边的熔化，上边的没熔化