B．left the woods and headed for the beach

　　C．separated from apes and appeared in the forests of Africa

　　D．discovered seafood was packed with omega3 fatty acids

　　答案：B　细节理解题。根据第五段从“Crawford claims, that human brain growth began to increase rapidly once we left the woods and headed for the beach.”可知答案。

　　19．What's the main idea of Paragraph 6?

　　A．Scientists help people overcome depression.

　　B．Fish is a kind of symbol in some religions.

　　C．Eating fish regularly may reduce our depression.

　　D．Happiness is linked with good health.

　　答案：C　主旨大意题。第六段的中心句是第一句“...Scientists have also discovered that people who eat fish regularly are less likely to suffer from depression”，其余句子都是围绕这个中心内容的。

　　20．What can we infer from the passage?

　　A．It's good to our health to swim under the waves.

　　B．Human has the largest and most complex brains.

　　C．Beach is the best destination of vacation.

　　D．It's human nature to seek out bodies of water.

　　答案：D　推理判断题。从第一段和最后一段的内容可以推知，喜欢水并寻找有水的地方是人类的天性。

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