题目内容：
6. On April 15th, people have to pay for the previous year.A.taxes on whisky
B.all the taxes
C.federal income taxes
D.taxes on trade
7. The Congress was given the power to collect income taxes in .
A. 1791 B. 1913 C. 1800s D. 2003
8. It can be inferred from the passage that the Sixteenth Amendment concerns .
A.collecting taxes on alcohol production
B.collecting personal income taxes
C.increasing income taxes on business
D.reducing income tax rates
9. In 2003, how much federal income was provided by the personal income tax?
A.37% B. 40% C. 43% D. 83%
10. According to the passage why do most American taxpayers ask tax preparers to deal with taxes?
A. Because tax payment is a lengthy and complex process.
B. Because taxpayers want to enjoy some tax credits.
C.Because taxpayers know nothing about the complex tax laws.
D.Because tax preparers are more professional in dealing with taxes.
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