题目内容：

任务型阅读。

There is not enough oil in the world now. As time goes by, it becomes less and less. So what are we going to do when oil runs out? Maybe we need the horses again.

In the Second World War, some people didn’t use gas made from petroleum(石油) in their cars. They made gas from wood and plants instead. The car didn’t go fast, but this was better than nothing. However, in the future, we can’t cut down all our trees to make gas.

Besides different types of gas, we can also use electricity to run our cars, but first we must make electricity! Some countries have coal and make electricity with that, but we might not always have coal, either. Other countries have big, strong rivers, and they can use the power of water to turn turbines(涡轮机) and make electricity easily and cheaply.

We are also able to get power from the ocean tides(海潮). When the tide comes in , the water turns the turbines and when it goes out, it turns them again.

1.Is there enough oil in the world now?

2.When might people have to go back to use horses?

3.What did some people use to make gas in the Second World War?

4.What are you able to get from the ocean tides?