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根据以下资料，回答下面问题。“十一五”期间，我国公路、铁路迎来了史无前例的高速、跨越式发展。截止到2010年底，全国公路网总里程达到398.4万公里，比2005年增加63.9万公里。国省干线公路里程达到46.22万公里，其中国道16.39万公里、省道29.83万公里，比“十五”末分别增加了3.12万公里和6.44万公里。“十一五”期间，国家高速公路网中重点建设的“五射两纵七横”14条线路中，已建和在建路段达到95%以上。“十一五”末高速公路里程达到7.41万公里，比“十五”末增加了3.31万公里，年均增长12.6%，“十一五”新增高速公路里程占全部高速公路的44.5%。2010年，全国公路客运量306.26亿人，旅客周转量14914亿人公里，货运量242.53亿吨，货物周转量43005亿吨公里。2010年，全国铁路客运量16.76亿人，旅客周转量8762.2亿人公里，货运量36.43亿吨，货物周转量27644.1亿吨公里，分别比2005年增长45.0%、44.5%、35.3%、33.4%，年均分别增长7.7%、7.6%、6.2%、5.9%。“十一五”期间，全国铁路客运量72.8亿人，货运量163.0亿吨，分别比“十五”增长35.9%、42.9%，均创历史新高。 “十一五”期间，全国铁路货运量比“十五”期间增加了：
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设函数f(x)连续，且f"(0)＞0，则存在δ＞0使得______．
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A Gay BiologistMolecular biologist Dean Hamer has blue eyes, light brown hair and a good sense of humor. He smokes cigarettes, spends long hours in an old laboratory at the US National Institute of Health, and in his free time climbs up cliffs and points his skis down steep slopes. He also happens to be openly, matter-of-factly gay. What is it that makes Hamer who he is What, for that matter, accounts for the talents and traits that make up anyone’s personality Hamer is not content merely to ask such questions: he is trying to answer them as well. A pioneer in the field of molecular psychology, Hamer is exploring the role of genes in governing the very core of our individuality. To a remarkable extent, his work on what might be called the gay, thrill-seeking and quit-smoking genes reflects how own genetic predispositions. That work, which has appeared mostly in scientific journals, has been gathered into an accessible and quite readable form in Hamer’s creative new book, Living with Our Genes. "You have about as much choice in some aspect of your personality," Hamer and co-author Peter Copeland write in the introductory chapter, "as you do in the shape of your nose or the size of your feet". Until recently, research into behavioral genetics was dominated by psychiatrists and psychologists, who based their most compelling conclusions about the importance of genes on studies of identical twins. For example, psychologist Michael Bailey of Northwestern University famously demonstrated that if one identical twin is gay, there is about a 50% likelihood that the other will be too. Seven years ago, Hamer picked up where the twin studies left off, homing in on specific strips of DNA that appear to influence everything from mood to sexual orientation. Hamer switched to behavioral genetics from basic research, after receiving his doctorate from Harvard, he spent more than a decade studying the biochemistry of a protein that cells use to metabolize heavy metals like copper and zinc. As he was about to turn 40, however, Hamer suddenly realized he had learned as much about the protein as he cared to. "Frankly, I was bored," he remembers, "and ready for something new." Homosexual behavior, in particular, seemed ripe for exploration because few scientists had dared tackle such an emotionally and politically charged subject. "I’m a gay," Hamer says with a shrug, "but that was not a major motivation. It was more of a question of intellectual curiosity—and the fact that no one else was doing this sort of research." The first paragraph describes Hamer’s ______.
A Gay BiologistMolecular biologist Dean Hamer has blue eyes, light brown hair and a good sense of humor. He smokes cigarettes, spends long hours in an old laboratory at the US National Institute of Health, and in his free time climbs up cliffs and points his skis down steep slopes. He also happens to be openly, matter-of-factly gay. What is it that makes Hamer who he is What, for that matter, accounts for the talents and traits that make up anyone’s personality Hamer is not content merely to ask such questions: he is trying to answer them as well. A pioneer in the field of molecular psychology, Hamer is exploring the role of genes in governing the very core of our individuality. To a remarkable extent, his work on what might be called the gay, thrill-seeking and quit-smoking genes reflects how own genetic predispositions. That work, which has appeared mostly in scientific journals, has been gathered into an accessible and quite readable form in Hamer’s creative new book, Living with Our Genes. "You have about as much choice in some aspect of your personality," Hamer and co-author Peter Copeland write in the introductory chapter, "as you do in the shape of your nose or the size of your feet". Until recently, research into behavioral genetics was dominated by psychiatrists and psychologists, who based their most compelling conclusions about the importance of genes on studies of identical twins. For example, psychologist Michael Bailey of Northwestern University famously demonstrated that if one identical twin is gay, there is about a 50% likelihood that the other will be too. Seven years ago, Hamer picked up where the twin studies left off, homing in on specific strips of DNA that appear to influence everything from mood to sexual orientation. Hamer switched to behavioral genetics from basic research, after receiving his doctorate from Harvard, he spent more than a decade studying the biochemistry of a protein that cells use to metabolize heavy metals like copper and zinc. As he was about to turn 40, however, Hamer suddenly realized he had learned as much about the protein as he cared to. "Frankly, I was bored," he remembers, "and ready for something new." Homosexual behavior, in particular, seemed ripe for exploration because few scientists had dared tackle such an emotionally and politically charged subject. "I’m a gay," Hamer says with a shrug, "but that was not a major motivation. It was more of a question of intellectual curiosity—and the fact that no one else was doing this sort of research." Hamer was a ______.
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