下列说法正确的是：[ ]
A．“地心说”的代表人物是哥白尼
B．“日心说”的代表人物是托勒密
C．第谷和开普勒通过大量的天文观测和数据分析完善了“地心说”
D．第一次通过实验比较准确地测出万有引力常量的科学家是卡文迪许
答案：D
题目分析：“地心说”的代表人物托米勒，日心说的代表人物是哥白尼，AB错误，开普勒发现了天体运动三定律，比地心说更进步，C错误，卡文迪许通过扭秤实验测得了万有引力常量，D正确，
故选D
点评：高中物理牵涉的人物比较多，在平时的学习过程中需要多积累，多记忆，多区分，不能张冠李戴
Water costs money．In some places water is hard 1 ．What 2 when a town has these problems？A small town in California found a happy 3． Very little rain ever fell there．The town had no water of its own．The water it used was 4 from a river 300 miles away．As more people 5 live in the town， 6 water was needed．Now water 7 to be brought in from 600 miles away．All these cost 8 money． The town 9 a plan．It found a way to clean its “dirty” water．Once the cleaned water was reused 10 many ways．Five man-made lakes were built．Here people could swim and fish and go 11 ．They could have picnics in their new parks．Farmers had more water 12 their crops．New factories can be built，now that they have the promise of 13 ． In most places，water is used and thrown 14 ．The town that saved 15 water has saved the town！
小题3:A．key B．answer C answering D．way
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