单项选择题

It is not easy______the answer to the difficult math problem.

A．to figure out
B．figuring out
C．figure out
D．being figured out
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单项选择题
What is the most important function of trees
A．Providing fuel.
B．Offering shade.
C．Preventing natural disaster.
D．Providing wood.
单项选择题
According to the passage, Adam Smith was the first person to______.
A．take advantage of the physical labor
B．introduce the division of labor into England
C．understand the effects of the division of labor
D．explain the bad causes of the division of labor
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