更多"How can we avoid a worldwide water "的相关试题:
[填空题]How can we support mechanism
[单项选择]How can we get to New York
A. By plane.
B. By bike.
C. By motorbik
[单项选择]How can we get 3-D images
A. use CAT and SGI
B. use photograph
C. use medicine
D. use software
[单项选择]How can we get rid of garbage Do we have enough energy sources to meet our future energy needs
These are two important questions that many people are asking today. Some people think that man might be able to solve both problems at the same time. They suggest using garbage as an energy source.
For a long time people buried garbage or dumped it on empty land. Now, empty land is scarce. But more and more garbage is produced each year. However, garbage can be a good fuel to use. The things in garbage do not look like coal, petroleum, or natural gas; but they are chemically similar to these fossil fuels. As we use up our fossil--fuel supplies, we might be able to use garbage as an energy source.
Burning garbage is not a new idea. Some cities in Europe and the United States have been burning garbage for years. The heat that is produced by burning garbage is used to boil water. The steam that is produced is used to make electricity or to heat nearby buildings. In Paris, France,
A. the heat produced is used to boil water
B. the steam produced is used to make electricity
C. the garbage burned is turned into fossil fuels
D. the steam produced is used to heat buildings