We know that fish and the sea are good for us, and so we seek them out. We vacation on the coast and see the waves come and go, feeling happiness has taken over our brain. When we move inland, or go home from vacation, we lose touch with our sea roots and feel unhappy.

　　文章大意：这是一篇说明文。喜欢水并寻找有水的地方是人类的天性。

　　16．To explain human's favor for water, the author ________.

　　A．lists some examples

　　B．compares some facts

　　C．analyzes some numbers

　　D．raises some questions

　　答案：A　写作手法题。为了说明人们对水的偏爱，作者在第一段里列举了许多例子。

　　17．Human beings have benefited a lot from seafood because ________.

　　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

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