[說話題目]請說說你對不同發電方法的看法

Burning of fussil fuel
Good
*cheap
*can generate lots of electricity

Bad
*give out sulphur dioxide and nitrogen oxide ang cause acid rain
*Give out carbon dioxide and make the gobal warming become more serious.

water power
Good
*less pollution
*reduce the flood

Bad
*expensive to build
*many people will die if it broken

biofuel
Bad
*if the food is used to generate electricity, it may cause food shortage
*some forest will be destroied to grow the biofuel.

發電只需要發電機，你的看法是如何推動發電機，只有風力，水力，及人力合乎要求，你可集中大做文章。