| listening 的部分 是在longman 教程 绿色封面的wrting post test里面 是第四张cd中的内容 
 Reading passage:
 According to the law of unintended consequences, actions of individuals, groups, or governments have effects, or “consequences” that are unexpected, or “unintended.” These unexpected effects, or unintended consequences as they are called in academic literature, are effects that are not planned when an original action is taken, and the person or persons making the decision do not consider that these effects may result from the action taken.
 
 Unintended consequences may turn out to be positive or negatives. Unintended consequences that are positive may result, for example, from a decision by a city council to ban cars from main street in the city. If, as a result of this decision, there is an unexpected effect that many citizens improve their health because they need to park their cars and walk on a regular basis to get to business that line main street, the this is a positive effect. There can, however, also be negative consequences of this decision by the city council to ban cars on main street. If, as a result of this decision, citizens decide that it is too much trouble to get to the businesses on main street because they cannot take their cars there, then they might decide to go to businesses elsewhere because it is easier to get there. A loss in the number of customers visiting the businesses along main street would be a definitely negative effect of the decision by the city council that was absolutely not intended by the city council when the decision was made
 
 In this set of materials, the reading passage describes a concept named unintended consequences, the listening passage describes a specific example of these consequences.
 
 The reading passage discusses unintended consequences which means persons who make the decision do not consider that the effects may result from these actions. Moreover, the reading passage provides two kinds of unintended consequences: positive ones and negative ones. And the reading passage also gives an example to explain the difference between them. If citizens’ health improved because of the ban which said cars are forbidden in the main street, it is called positive effects, however, if less customers went shopping in this street, it is called negative effects.
 
 The listening passage provides us with a specific example about negative effects. The unintended consequences may happen in various fields, but the listening passage gives us a example concerning with government decision. Taxes in a district are raised by government in order to increase the revenue, but the consequences come unexpectedly, because the taxes are raised, people have less money to spend and buy fewer goods, so the companies who sell goods have to lay off some of their employees, these employees do not have to pay taxes because they have no jobs, then at last the taxes in this district decrease which is totally opposite to their original plan..
 
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