在楼房里遇到地震时，应如何避震（    ）

    It is necessary to relax ourselves after the exam. There are some kinds of  activities for us to take part in. First of all, we can go for a w____ along the bank of the river. We can also go to the movies or listen to music. What's more, joining in a sports club is a good c____, which can keep us healthy. For example, p____ football in the afternoon may relax ourselves. Above all, we should arrange(管理) our time p____ and live a regular(规律的) life. I hope all of us can have a wonderful time.

“为了安全，请勿超速”．如图，一条公路建成通车，在某直线路段MN限速60千米/小时，为了检测车辆是否超速，在公路MN旁设立了观测点C，从观测点C测得一小车从点A到达点B行驶了5秒钟，已知∠CAN=45°，∠CBN=60°，BC=200米，此车超速了吗？请说明理由．（参考数据：$\sqrt{2}$≈1.41，$\sqrt{3}$≈1.73）