填空题.It may come as a surprise to many an exhausted mother or father—but thinking about your children could improve your memory, a study suggests. Researchers 1 that when thinking about raising children, an adult's memory "goes up a gear". It seems that the 2 necessity to protect children helps our brains to store information we would otherwise forget. Researchers at Binghamton University, New York carried out a series of tests to see if thinking about bringing up children improved one's sense of 3 and found that it did. Ralph Miller, a psychology professor said, "Our ability to think and memorize information arises from our nervous systems. As our nervous systems are a product of 4 and past experiences, one can 5 expect that how well we memorize information today is 6 by natural selection that occurred among our ancestors long ago." Professor Miller and his colleagues tested the theory by asking 7 to imagine they were living in the ancient grasslands of Africa, and to remember a series of words such as rock, apple, ball and stick. They were asked to rate the relevance of each item to how much use it was to their survival. When presented with a 8 that involved raising children they remembered many more of the words. But in another situation—a task involving finding a mate—the memory was not so good. The researchers said that while both activities 9 to survival, our prehistoric ancestors may not have realized that mating could result in children because of the nine months between mating and 10 . This research demonstrates that our genes not only have an impact on our anatomy (解剖构造) and physiology, but also on the ways in which we think. A. biological F. influenced K. relate B. birth G. objected L. reverse C. claim H. premier M. scenario D. consequent I. reasonably N. simply E. evolution J. recall O. subjects