题干

小敏在“抛一枚均匀硬币”的试验中忘记带硬币了,她想用其他东西代替.这时,她看到书包里自己带的矿泉水,于是她灵机一动.把瓶盖拧下来代替均匀硬币进行模拟试验,从而得一个试验结果.你认为她的做法对吗?
上一题 下一题 0.0难度 选择题 更新时间:2018-10-27 12:27:56

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解:因为瓶盖正反质量不均匀,从而出现的概率不同,所以做法不对.

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    Do you want to live another 100 years or more? Some experts say that scientific advances will one day enable humans to last tens of years beyond what is now seen as the natural limit of the human life span.

    “I think we are knocking at the door of immortality (永生),” said Michael Zey, a Montclair State University business professor and author of two books on the future. “I think by 2075 we will see it and that's a conservative estimate (保守的估计).”

    At the conference in San Francisco, Donald Louria, a professor at New Jersey Medical School in Newark said advances in using genes as well as nanotechnology (纳米技术) make it likely that humans will live in the future beyond what has been possible in the past. “There is a great effort so that people can live from 120 to 180 years,” he said. “Some have suggested that there is no limit and that people could live to 200 or 300 or 500 years.”

    However, many scientists who specialize in aging are doubtful about it and say the human body is just not designed to last past about 120 years. Even with healthier lifestyles and less disease, they say failure of the brain and organs will finally lead all humans to death.

    Scientists also differ on what kind of life the super aged might live. “It remains to be seen if you pass 120, you know; could you be healthy enough to have good quality of life?” said Leonard Poon, director of the University of Georgia Gerontology Centre. “At present people who could get to that point are not in good health at all.”