精听建议：

先完整地把一条新闻听一到三遍，争取掌握大意。然后，一句一句精听，力争每句话都听明白。遇到实在不懂的地方，再听写。

下面的文本材料中空缺部分里面要填的词都很简单，不过是一些值得注意的连读或者典型的美式发音哦，有些语速比较快。试试看，你能不能全部写对？

（参考文本，欢迎指正^^）

Lesson25 Power

There is not enough petrol in the world for everybody now, and each year there is 1 , so what are we going to do when it finishes? Perhaps we will go back to 2 and bicycles.

In the Second World War, some people did not use petrol in their cars. They made 3 from wood and plants instead, and then they put it in big bags on top of their cars. The cars did not go fast, but it was better than nothing. We cannot cut down all our trees to make gas; we need them for other things too.

Besides gas, we can also use 4 for our cars, but first we must make the electricity! Some countries have coal, and they make electricity with that, but we will not always have coal. Other countries have great rivers, which turn turbines and generate electricity more easily and cheaply.

We are also able to get power from the tides. We put turbines in the mouth of a river. Then, when the tide 5 , it turns the turbines, and when it runs back towards the sea, it turns them again. We know that the waves of the sea can also turn turbines when they go up and down. Will all of these things generate our electricity in the year 2050?

■填空答案■