1921年通过了以粮食税代替余粮收集制的决定。从此，苏俄开始从战时共产主义政策向新经济政策过渡。结合上述材料和相关知识回答：

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                                                                                                                Hungry for Home

     If my life were a1, I would fast-forward through senior high. My senior years were 2. Like every junior high kid, I was3 with who I was and how I would4 in life.

     I tried and failed in a number of things I wanted to excel in sports but had not yet5that would never happen. I remember being 6 by most of my peers and being cut from the basketball team and7 to play football. To be loved and accepted seemed to me at the time something I could never,8 , achieve.

     During that time I went through the cafeteria line and ate alone, feeling unloved and 9One day I 10 that I had no one to eat with. Mom said to me, "If you want, you can come home for 11 ." As soon as the bell 12 at noon and I left the school and ran home that day my mom sat across the13 for about 15 minutes and looked at me and listened to me and three 14 later I still remember those times with 15. She just paid attention to me.

     I now know that I didn't need my 16 filled as much as I needed my emotional fuel tank refilled. I just needed a17 place of warm acceptance for a few minutes a day. Now you know a little more about how I18 home.

Home is a place where you don't have to 19 alone and eat. Home is a place where people don't20 you and avoid you.

科斯定理（Coase theorem）是由罗纳德．科斯（Ronald Coase）提出的一种观点，认为在某些条件下，经济的外部性（指某个经济实体的行为使他人受益或受损，却不会因之得到补偿或付出代价）可以通过当事人的谈判而得到改变，从而达到社会效益最大化。科斯定理提供了一种通过市场机制解决外部性问题的新思路和方法，在这种理论的影响下，美国和一些国家先后达成了污染物排放权或排放指标的交易。由此可见（    ）

①市场的外部性问题必须由国家宏观调控解决

②市场主体需要遵守市场交易规则

③市场对资源配置起决定性作用

④明确产权是通过市场实现 资源配置的基础