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personal income taxes, property taxes, social insurance taxes, and sales taxes. Over 60% of the government revenue in the U.S. is collected by the federal government. This does not include taxes collected by state and city government.5 Every market economy suffers from business cycles. Governments, through their control of taxes and government spending and through their ability to control the quantity of money, often attempt to modify fluctuations in the business cycle. For instance, the government may reduce taxes in a recession in the hope that people will increase spending and thus raise the GNP.
参考答案： B 答案解析：
1The government may reduce taxes in a recession in order to _________.
A.apply to all businesses. B.raise the GDP. C.state and city government D.reduce spending E.modify fluctuations in the business cycle F.produce and sell goods
参考答案： C 答案解析：
2The government revenue in the U.S. is collected by the federal government and _________.
A.apply to all businesses. B.raise the GDP. C.state and city government D.reduce spending E.modify fluctuations in the business cycle F.produce and sell goods
参考答案： F 答案解析：
3Besides buying and producing services, governments also _________.
A.apply to all businesses. B.raise the GDP. C.state and city government D.reduce spending E.modify fluctuations in the business cycle F.produce and sell goods
参考答案： A 答案解析：
4Governments regulate economic behavior, and the regulations _________.
A.apply to all businesses. B.raise the GDP. C.state and city government D.reduce spending E.modify fluctuations in the business cycle F.produce and sell goods
参考答案： E 答案解析：
5Paragraph 5 _________.
A.Collecting Taxes B.Making Transfer Payments C.Making Laws and Regulations D.Buying and Selling Goods and Services E.Stabilizing the Economy F.Controlling the Market
参考答案： A 答案解析：
6Paragraph 4 _________.
A.Collecting Taxes B.Making Transfer Payments C.Making Laws and Regulations D.Buying and Selling Goods and Services E.Stabilizing the Economy F.Controlling the Market
参考答案： B 答案解析：
7Paragraph 3 _________.
A.Collecting Taxes B.Making Transfer Payments C.Making Laws and Regulations D.Buying and Selling Goods and Services E.Stabilizing the Economy F.Controlling the Market
参考答案： D 答案解析：
8Paragraph 2 _________.
A.Collecting Taxes B.Making Transfer Payments C.Making Laws and Regulations D.Buying and Selling Goods and Services E.Stabilizing the Economy F.Controlling the Market
阅读理解
（第31—45题，每题3分，共45分;下面有3篇短文，每篇短文后有5道题。请根据短文内容，为每题确定1个最佳选项。）1、Endangered Species Endangered species are plants and animals that are in immediate danger of extinction. Extinction is actually a normal process in the course of evolution. Since the formation of the earth, many more species have become extinct than those exist today. These species slowly disappeared because of change of climate and thei
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