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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热门试题

单项选择题

In analyzing a problem we should do all the following except （）

A．recognize and define the problem
B．look for information to make the problem clearer
C．have suggestions for a possible solution
D．find a solution by trial or mistake

单项选择题

What two problems can man solve by burning garbage（）

A．The shortage of energy and air pollution.
B．The shortage of energy and the land to hold garbage.
C．Air pollution and the shortage of fossil fuel.
D．Air pollution and the shortage of land to hold garbag