看图写话。

城市里部分道路设计成如图所示，这种下凹道路在控制噪声方面的作用是（  ）

如右图所示，电源电压保持不变，当闭合开关后，滑动变阻器 的滑片向左移动的过程中，下列说法正确的是（   ）

某商厦每层楼高3m，小明看到工作人员将360kg的货物在一楼放入载货电梯内，闭合开关，仅用25s的时间，便将货物运到六楼，小明对载货电梯产生了浓厚的兴趣，他通过查阅资料了解到该载货电梯的结构及式作电路如图所示，电梯是通过电动机带动钢丝绳提升货物的，电动机线圈电阻为2.4Ω，电梯厢（含动滑轮）的质量140kg，提升上述货物时电流表的示数为20A，不计钢丝绳的重力和一切摩擦，请解答下列问题（g取10N/kg）：

根据短文内容，选择正确的选项。
    Modern life is impossible without traveling. The fastest way of traveling is by plane. With a modern airliner(客机), you can travel in one day to places which needed a month or more to get to hundreds of years ago.
    Traveling by train is slower than by plane, but you can see the places you are traveling through. Modern trains have comfortable seats and dining-cars. They even make the longest journey enjoyable(令人愉快的).
    Some people prefer to travel by sea. You can visit many other countries or different parts of your country. Ships are not so fast as trains or planes, but traveling by sea is a very pleasant way to spend a holiday.
    Many people like to travel by car. You can make your own timetable. You can travel three or four hundred miles or only fifty or one hundred miles a day, just as you like. You can stop if there is something interesting, for example, at a good restaurant where you can enjoy a good meal, or at a hotel to spend the night. That’s why traveling by car is popular for pleasure trips, while people usually take a train or a plane when they travel on business.