A、B、C、D、E、F、G是初中化学常见的物质，A在常温下是一种无色液体，D是天然气的主要成分，G是大理石的主要成分，它们逐渐是转化关系如图所示：

请回答：

为控制人口数量和提高人口素质，我国已把计划生育列为一项基本国策，其具体要求是晚婚、晚育，____和____。

    1children like to watch TV. It' s very 2. On TV3can see and learn a lot and know many things 4 their country and the world.5they can learn over the radio. But they can learn better and more easily on6.Why? Because they can hear and watch at the same time. But they can' t 7 anything over the radio.

    Many children watch TV only on Saturday or Sunday evening.They are 8 busy with their lessons. But a few children watch TV every 9. They go to bed very late. They can' t have a good10. How about you, my young friend?