The government may control prices when there is a problem such as rapidly increasing ren

The government may control prices when there is a problem such as rapidly increasing rents or a rise in the cost of living.When the government controls prices，there is no longer a normal relationship between the price of a product and the quantity consumers will buy.Government controls may help in an emergency(紧急情况).However，some economists believe that controls can have negative effects over a long period of time.In cities with rent control，the city government sets the maximum rent that a landlord(房主)can charge for an apartment.Supporters of rent control argue that it protects people who are living in apartments.Their rent cannot increase;therefore，they are not in danger of losing their homes.However，the critics(批评者)say that after a long time，rent control may have negative effects.Landlords know that they cannot increase their profits.Therefore，they invest in other businesses where they can increase their profits.They do not invest in new buildings which would also be rent-controlled.As a result，new apartments are not built.Many people who need apartments cannot find any.According to the critics，the end result of rent control is a shortage of apartments in the city.Economic theory predicts the results of economic decisions such as decisions about rent control，price control and the minimum wage.The predictions may be correct only if other things are equal.Economists do not agree on some of the predictions.They also do not agree on the value of different decisions.Some economists support a particular decision while others criticize it.Economists do agree，however，that there are no simple answers to economic questions.

1. According to Paragraph 1，price control _____.

A. does more harm than good

B. is good in every sense

C. is necessary but harmful in the long term

D. should be avoided

2. It can be inferred from Paragraph 2 that _____.

A. thanks to rent control，it would be easier for many to find apartments

B. landlords may take back their apartments if the rent is too low

C. the tighter the rent control is，the fewer new apartments will be built

D. landlords will not invest in other businesses after price control is approved by the government

3. Which of the following do all economists agree on？_____

A. Controls can have negative effects over a long period of time.

B. The government must take measures to control rent increase.

C. The maximum rent system protects people who don"t have their own houses.

D. Economic questions are difficult to deal with.

4. The attitude of the author to price control is _____.

A. subjective

B. objective

C. indifferent

D. supportive

5. The purpose of this passage is to _____.

A. argue

B. persuade

C. analyze

D. describe

请帮忙给出正确答案和分析，谢谢！