单项选择题

For how many years has aluminum been marketed

A．40.
B．75.
C．80.
D．150.
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单项选择题
This passage would most probably belong to which of the following subjects
A．Military history.
B．Social work.
C．Psychology.
D．Political science.
单项选择题
What is the main purpose of this passage
A．To prove that taxes in the United States are too high.
B．To show the importance of tax collection.
C．To compare the three types of taxes in the United States.
D．To explain the percentage of federal taxes.
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