1. “Teach Your Child How to Think” offers lessons in perception improvement, of clearly seeing the implications of something you are saying and of exploring the alternatives. （Passage One）
2. Finding ways to get more and better sleep can be a challenge. Scientists have identified more than 80 different sleep disorders. Some sleeping disorders are genetic. But many problems are caused by staying up late and by traveling frequently between time zones or by working nights. （Passage Two）
3. Selling online carried its own risks, however. With so many companies competing for consumers' attention, price competition was intense and profit margins thin or nonexistent. （Passage Three）
4. Road politeness is not only good manners, but good sense too. It takes the most cool-headed and good-tempered of drivers to resist the temptation to revenge when subjected to uncivilized behaviors. （Passage Four）
5. Never mind something as complex as conversations: the most powerful computers struggle to reliably recognize the shape of an object, the most elementary of tasks for a ten-month-old kid. （Passage Five）
