题目

假定你是李华，近期你看到了共享单车（shared bikes）“绿色出行”的宣传后决定改变出行方式，并发现骑单车的许多好处。请你就此为校刊“英语园地”写一篇短文。注意：1).词数100左右；2).可适当增加细节，以使行文连贯。 答案：Being driven by my father to school every day,I've recently noticed many shared bikes parked along the road in my neighborhood.Exposed to many media calling for Green Travel,I think it my duty to do something.One day I told my father that I would give up his car and rent a bike instead. Back home that day,I searched the Internet to find ways to use the shared bikes. To my surprise,it's very easy t改变汽车的质量和速度，都能使汽车的动能发生改变，如果质量减半，速度增大到原来的4倍，汽车的动能各是原来的几倍？