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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单项选择题

According to the passage, if we want to get promotion nowadays we have to ______.

A．produce proof of our qualifications
B．write a paper about our qualifications
C．apply to take a certificate
D．apply for a diploma course

单项选择题

For how many years has aluminum been marketed

A．40.
B．75.
C．80.
D．150.