综合写作：
高速限速speed limit
阅读：文章说汽车应该限速行驶(降低high way speed limit)，因为这样做会带来好处
(1)可以减少严重事故，举了1974 年的数据做例子。1974年美国实行限速令 交通事故总量稳定下降
(2)可以改善环境，减少废气排放。当你从大于等于80 km每hour到小于80km每hour时你就会减少5-10%的气体排放量
(3会带来经济效益的，更低的速度可以减少汽油耗费从而省钱。
听力：说限速的确有好处，但效果不显著
(1)没有确凿的证据证明速度降低和事故减少直接有关係。
因为在速度降低之前事故就有降低的趋势，很可能降低的那十年是这个趋势的延续效果;还有road design 和汽车安全性能safety equipment提高也有可能降低事故。另外，事故发生的原因不仅仅在于速度，也在于天气路况等因素。
(2) 确实会减少排放，但是废气排放的减少不一定需要限速。举例在Texas 做了实验，污染指标只会下降0.5%，这个效果在城市中微乎其微。
(3)限速会带来不好的经济效应，以货车司机为例，司机如果被强制开慢，他们运输时间变长，工时上涨，使运输成本上涨，从而导致物价上涨。
The advice from grandparents has no use for their grandchildren because the world changed a lot during the past 50 years.
Our world has changed so much in the last half a century. The invention of the internet alone has altered society to an astounding degree. Given that the world we live in now is so drastically different than the world of 50 years ago, can the advice of grandparents still be relevant for their grandchildren? I think so.
For one thing, even though society has changed in countless ways, some things are still the same. We still have many of the problems we had 50 years ago. For example, things like war, hunger, and social inequality are still pervasive issues in today’s world. Because of that, a lot of the advice relevant 50 years ago will still be applicable today. I remember that my grandmother once telling me that she worked to feed the poor when she was younger. She then advised me to pursue philanthropic work at some point in my life. She said for her, philanthropic work gave her some of the most meaningful experiences of her life. This was true 50 years ago, and it likely still holds true today.
For another thing, even though some advice from grandparents can be incredibly outdated, it can be useful to get such a different perspective on things sometimes. My grandfather often tells me about his long and innocent courtship of my grandmother, and about all of the things he did in order to get her attention. I usually just smile and nod when he tells me to follow his example, though I never have any intention of using his tips. I think to myself, “Courtship today is such a different creature. We have cell phones and social networks and all of these different ways to interacting. How can such old fashioned thinking be relevant today?” But hearing his advice made me think about a different way of doing things, and so even though I would never chase a girl in the way he described, I can adapt some of his ideas to mix up. Girls today are used to being chased a certain way, but if you throw in a technique out of your grandpa’s playbook once in a while, you can surprise them and make a deeper impression.
Granted, we should not blindly heed all of our grandparents’ advice. Sometimes, the pointers they give really are too outdated to use. For example, my grandmother thinks I should get a Ph. D because it will help me get a job, but in reality, academic inflation is so severe today that a Ph. D will no longer guarantee you employment. Still, her advice did get me thinking about learning specific job skills to make me more competitive. In the end, I was still happy to hear her advice because it caused me to think about the issue in a different way.
The world has changed much since our grandparents’ time. However, their accumulated experience can still serve us well in our modern world. With an open mind and some common sense, we can still get a lot of the advice of our grandparents.
(编辑：suyan)