题目

71 Smoking is h_________ to health, but there are still many people picking it up. 72 You shouldn’t have had your son telling people _______(谎言) here and there 73 Many of them have a g________ for riding wild horses and can win thousands of dollars in prizes. 74.How can we ________(除去)the house of rats? 75.He is always sitting in the___________(在阴凉处) all day, doing nothing. 76 A lot of grain in China has been e_________ to foreign countries. 77 A large ____________(数量) of money is spent on advertisements every year. 78 She refused the job for _______(各种各样)r据调查，超速行驶是引发交通事故的主要原因之一．在一次社会实践中，小刚和他们小组的同学用所学习过的知识在一条笔直的道路上检测车速，如图，观测点C到到公路的距离CD为120米，检测路段的起点A位于点C的南偏西60°方向上，终点B位于点C的南偏西45°方向上．某时段，一辆轿车由西向东匀速行驶，测得此车由A处行驶到B处的时间为8秒．此车是否超过了该路段60米/秒的限制速度？说明理由．（参考数据：2≈1.4，3≈1.7）