【正确答案】 D

【答案解析】[听力原文] 29-31
Taxes are a big part in the United States. Most Americans pay city taxes, state taxes, social security taxes, sales taxes and the list seems endless.
The biggest tax for most Americans is that on the money they earn -- the income tax. The personal income tax is called a "progressive tax" because it takes more from those who earn more. For example, a person who earns about 3,500 dollars a year will pay a tax of only about 3.5 % of earning, but if the same person earned 85,000 dollars a year, he would pay an income tax of 35%.
Over the years the income tax has become more and more difficult for people to understand. Almost one half of all Americans now have to pay experts to prepare their tax reports, and in fact, preparing taxes and giving tax advice have become a big industry in America.
29. From whom is the social security tax collected?

A、 It's the tax collected for social progress.
B、 It's the tax that increases with each passing year.
C、 It's the tax that is collected from those who earn most.
D、 It's the tax that varies according to how much money a person earns.

【正确答案】 D

【答案解析】[听力原文]
What is a "progressive tax"?

A、 Because the list of taxes seems endless.
B、 Because they would rather spend their time and energy elsewhere.
C、 Because they are unable to write tax report all by themselves due to their limited knowledge about taxes.
D、 Because paying experts to prepare their tax report and asking for tax advice have become very popular.