49.C.【解析】主旨大意题。结合全文可知作者想要告诉读者的是“睡眠影响记忆”。
社会生活类
.
As a professor of business and government policy, I’ve long been interested in the pursuit of happiness as a national concept. According to surveys of thousands of people across the land, happy people are keys to making our nation healthy and strong. Happiness, in other words, is important for America. So when I came across data a couple of years ago saying that certain Americans were living in a manner that contributed to happiness—while others were not—I jumped on it.
I wanted to know which personal lifestyles and public policies would make us the happiest nation possible. I also wanted to know which of my own values, learned during my childhood and practiced during my career as a university professor, were the most concerned with happiness. First, just what is happiness? Most researchers agree that it involves an assessment of the good and bad in our lives. It’s the emotional balance sheet we keep that allows us to say honestly whether we’re living a happy life, in spite of bad things now and then.
You might guess that Americans are getting happier all the time. After all, many are getting richer, and this should make them better able and equipped to follow their dreams. On the other hand, there’s a lot of talk about the good old days, when kids could play outside without any worry about being kidnapped. And there’s a great deal of stress in this country right now, due to financial concerns, negative workplace environments, and health problems, among other pressing issues.
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