单项选择题

The heat that is produced by burning garbage can be used to（）

A．make electricity
B．make energy source
C．boil water
D．save coal

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单项选择题
Many of the students （）the work although it took some time to learn how to do it.

A．enjoy
B．have to do
C．hate
D．ignore
单项选择题
According to the passage, man will begin to think about such needs as housing and clothing only when（）

A．he has saved up enough money
B．he has grown dissatisfied with his simple shelter
C．he has satisfied his hunger
D．he has learned to build houses
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