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2015年GRE阅读理解36套题

2019-01-22 16:43:08来源：网络

　　为了帮助大家高效备考GRE，新东方在线GRE频道为大家带来“2015年GRE阅读理解36套题”，希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!

2015年GRE阅读理解36套题下载

　　

　　GRE阅读理解36套内容节选：

　　Exercise 1

　　Questions 1 to 3 are based on the following reading passage.

　　Immediately relevant to game theory are the sex ratios in certain parasitic wasp species that have a large excess of females. In these species, fertilized eggs Line develop into females and unfertilized eggs into males.

　　A female stores sperm and can determine the sex of each egg she lays by fertilizing it or leaving it unfertilized. By Fisher‘s genetic argument that the sex ratio will be favored which maximizes the number of descendants an individual will have and hence the number of gene copies transmitted, it should pay a female to produce equal numbers of sons and daughters. Hamilton, noting that the eggs develop within their host—the larva of another insect—and that the newly emerged adult wasps mate immediately and disperse,offered a remarkably cogent analysis. Since only one female usually lays eggs in a given larva, it would pay her to produce one male only, because this one male could fertilize all his sisters on emergence. Like Fisher, Hamilton looked for an evolutionarily stable strategy, but he went a step further in recognizing that he was looking for a strategy.

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