请就目前能源供求紧张的情况谈一谈自己的看法： Americans like to go out by car. Although more and more Chinese own cars,most Chinese still like to ride bicycles, This is determined by a lot of factors. As we all know, the bike advances slowly by manpower, but it can be placed wherever it is convenient However, as for the car, although it can run fast by engine, it must be parked at parking places. Most Americans live in the suburb which is far from urban areas and their working places. So they need cars to go shopping and go to work. And they also like traveling far. Thus a car brings them great convenience. On the contrary, most Chinese live near their working areas and markets. They don't need a car to go to work or go shopping. I would like to ride a bike, because it costs little and it is easy to use and won't cause pollution.