43. What was suggested about the construction of a new city at sea?
Ａ．The city was to be designed together with a harbor¹.
Ｂ．The walls around the city would be made of steel and glass.
Ｃ．The building of the city would rest on a floating island.
Ｄ．The people would live in tall building surrounded by a wall.
44. How would fresh water be supplied to the city?
Ａ．By treating sea water.
Ｂ．By getting it from the surrounding islands.
Ｃ．By building a small lake of fresh water inside the city.
Ｄ．By transporting it from the mainland².
45. The suggestion made by the organization is to solve the problem that _______.
Ａ．there is not enough space for building cites³ on land
Ｂ．land transportation⁴ has became increasingly⁵ difficult
Ｃ．there are too many people on land
Ｄ．present cities are heavily polluted⁶ by cars
46. the purpose of the writer is-_______.
Ａ．to suggest how new type of harbor could be built at sea
Ｂ．to give a description of a new--- type city.
Ｃ．to draw people s attention to the problem of air pollution.
Ｄ．to introduce a mew way of building harbor --- cities.

(D)
Taxes（税）are a big part in the United⁷ States. Most Americans pay city taxes, state taxes, social security⁸（安全）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 "progressive⁹ tax" because it takes more from those who earn more. For example, a person who earns about 3,500 dollars a tear will pay a tax of only about 3.5 % of earning, but of 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 mote¹⁰ 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 advice have become a big industry in America.
47. Most Americans pay ________.
Ａ．taxes which are too many to list.
Ｂ．taxes either to the cities or the states they live in.
Ｃ．so many kinds of taxes that they even don t know the names.
Ｄ．several kinds of taxes.
48. Social security tax is collected from _______.
Ａ．those who have broken the law.
Ｂ．those who often make trouble,
Ｃ．those whose lives and property¹¹ are in danger.
Ｄ．Every citizen living in the area in question(所在).
49. What is a " progressive tax"? A "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.
50. Why do almost one half of all Americans have to pay experts?
Ａ．Because the list of taxes seems endless.
Ｂ． Because they would rather spend their time and energy elsewhere¹².
Ｃ． Because they find their knowledge about taxes is so limited that they are unable to write tax
　 report all by themselves.
Ｄ． Because paying experts to prepare their tax report and asking for tax advice have become very popular.

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