D．If the African elephant disappears, the whole

　　ecosystem won't be affected.

　　答案：B　细节理解题。根据第二段第二句话可判断B项为正确答案。

　　40．The passage is developed mainly by ________.

　　A．showing the effect and then explaining the causes

　　B．pointing out similarities and differences

　　C．describing the changes in space order

　　D．giving examples

　　答案：A　通读全文可知，文章是先讲述大象寻找食物所带来的影响，然后解释原因，故选A项。

　　B

　　(2016·山东烟台高三调研)

　　Jeffrey Bezos, the founder, president and chairman of the board of Amazon. com, was born in Albuquerque, New Mexico. His mother's ancestors were early settlers in Texas, and over the generations had acquired a 25,000 acre farm at Cotulla. Jeffrey spent most summers of his youth working with his grandfather on their farm.

　　Jeffrey

　　showed

　　intense

　　and

　　varied

　　scientific interests at an early age. He set up an electric alarm to keep his younger sisters and brothers out of his room and changed his parents'

　　garage into a laboratory for his science projects.

　　After he graduated from Princeton University with a degree in computer science and electrical engineering, Jeffrey Bezos found employment on Wall Street, where computer science was increasingly in demand to study market trends. He rose quickly, becoming a senior vice president, and looked forward to a bright career in finance, when he made a discovery that changed his life, and the course of business history.

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