A．seafood has enough water and is fresh

　　B．fishes in the sea have large and complex brains

　　C．our ancestors had nothing to eat but seafood

　　D．it is abundant in fatty acids promoting brain cell growth

　　答案：D　细节理解题。从第四段最后一句“That seafood was packed with omega3 fatty acids, essential fatty acids that promote brain cell growth. ”可知答案。

　　18．According to Crawford, human brain developed fast when we ________.

　　A．went to the coast to spend our holidays

　　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。

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