Unit 15 Learning

　　Ⅰ.阅读理解

　　A

　　Maps of the world's population show that the majority of people today live near water. We live along coastlines, around bays, up the course of rivers and streams and on islands. We also vacation at the beach and find comfort fishing on a lake. Nothing makes small children happier than the chance of playing in water.

　　More surprisingly, this human favor for water makes evolutionary(进化的)sense. Sure, we need drinking water to live, but we have also benefited from what's swimming under the waves.

　　Neuroscientist Crawford of the University of North London has proposed that our ancient ancestors attached to the sea, and that their devotion paid off by allowing the human species to develop large and complex brains.

　　Crawford claims that when humans separated from apes(类人猿)and appeared in the forests of Africa, they stuck close to rivers and beaches and started catching fish, clams and crabs. That seafood was packed with omega3 fatty acids, essential fatty acids that promote brain cell growth.

　　It's no coincidence, Crawford claims, that human brain growth began to increase rapidly once we left the woods and headed for the beach.

　　Scientists have also discovered that people who eat fish regularly are less likely to suffer from depression than those who eat less seafood. Biochemist Hibbelin of the National Institutes of Health has shown that across cultures there is a direct link between amount of fish eaten each week and rates of depression. More interestingly, Hibbelin and researcher Laura have found that fish is commonly used as a symbol of happiness and good health in various religions and cultures.

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