阅读理解。 Taxes are a big part in the United States. Most Americans pay city taxes, state taxes, social security (安全) taxes, sales taxes… and the list seems endless. The biggest tax for most Americans is the incomes tax. The personal income tax is called a 'progressive tax', because it takes more from those who earn (挣钱) most. For example, a person who earns about ＄3,500 a year, will pay a tax of only about 3.5% of earning, but if the same person earned ＄85,000 a year, he would pay an income tax of 35%. Over years the incomes 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. In fact, preparing taxes and giving tax have become a big industry (工业) in America. 1. Most Americans pay ______. [     ] A. taxes which are too many to list B. taxes either to the cities or the states they live in C. several kinds of taxes D. so many kinds of taxes that they even don't know the names 2. Which is the biggest tax for most Americans is ______. [     ] A. the state tax B. the social security (安全) tax C. the income tax D. the city tax 3. Which of the following is NOT true? [     ] A. Americans have all kinds of taxes. B. Personal income tax is the biggest tax in American. C. The more a person earns, the more income tax he should pay. D. Personal income tax can prevent the rich from getting richer. 4. The so-called 'progressive tax' is the tax ______. [     ] A. collected for social progress B. that increases with each passing year C. that is collected from those who earn most D. that varies (变化) according to how much money a person earns 5. Why have preparing and giving advice become a big industry in America? Because . [     ] A. the list of taxes seems endless B. they would rather spend their time and energy elsewhere C. they find their knowledge about taxes is too limited to write a tax report by themselves D. paying experts to prepare their tax reports and asking for tax have been very popular g