1.
Compare air power car, electric
car and normal car.
Question: which
one is cheaper?
Which one is faster?
Which one cost much money
per money?
Is
it possible to use air power care or electric car to instead oil car?
Thesis:
electric car will be major car in several years.
2.
Compare solar power station,
water power station and fire power station.
Question: which one is best?
Which
one is less pollution?
Which
one provides the most power?
Which one is the easiest to
creat?
Thesis: solar power station is the best power station.
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