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

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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

单项选择题

Based on the passage, it seems that the purpose of the cafe is to（）

A．learn a skill
B．help a youth project
C．do business
D．earn school credit