已知Dosomething定义如下：delegatevoiddosomething()类Someclass定义如下：classsomeclass{publicvoidsleep(){Console.writeline(“sleep”);}publicdosomethingm1=null;publicvoidDosleep(){……………….}}则在someclass类的方法Dosleep内，可用下列哪些方法利用变量m1调用类someclass的方法sleep?()(2分)
A. m1=new dosomething(sleep) m1()
B. m1=new dosomething( Addressof sleep) m1()
C. m1=new dosomething(sleep) m1.Invoke()
D. m1=new dosomething( Addressof sleep) m1.Invoke()
查看答案
An externality is the uncompensated impact of
A. society's decisions on the well-being of society.
B. a person's actions on that person's well-being.
C. one person's actions on the well-being of a bystander.
D. society's decisions on the poorest person in the society.
If a sawmill creates too much noise for local residents,
A. noise restrictions will force residents to move out of the area.
B. a sense of social responsibility will cause owners of the mill to reduce noise levels.
C. the government can raise economic well-being through noise-control regulations.
D. the government should avoid intervening because the market will always allocate resources efficiently.
When positive externalities are present in a market
A. private benefits will be greater than social benefits.
B. social benefits will be greater than private benefits.
C. only government regulation will solve the problem.
D. the market will not be able to generate an equilibrium.
Which of the following is an example of a positive externality?
A. Local high school teachers have pizza delivered every Friday for lunch.
B. Your neighbor plants a nice garden in front of his house.
C. An avid fisherman buys new fishing gear for his next fishing trip.
D. A local manufacturing plant pollutes a nearby stream.
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