You should try to ________ her doubts and let her understand your mind.

A. replace                            B. review                      C. remove                    D. rebuild

 In the last few years thousands of films________ all over the world.

A. have produced                                             B. have been produced 

C. are producing                                          D. are being produced

Is it on September 1st ________ students come back to school every year?

  A. when                     B. that                   C. which                D. who

--- You must thirsty, Mr. Smith. Shall I bring you a cup of tea?

--- ________.

A. That’s very kind of you

B. Don’t mentioned it

C. You are welcome

D. Just do as you please

 To be honest, a lot of people ________ great importance to becoming rich and famous.

   A. attach                      B. attack                    C. attempt                   D. attract

As some of these actors could not sing well enough, they had to ________ other musicians to help them.

   A. rely on                     B. work on                  C. focus on                 D. go on

Many of the umbrellas prepared for customers disappeared, but nobody admitted ________ one on purpose.

A. take                B. to take             C. having taken         D. to have taken

She often helps the students ________ she thinks are not good at English.

A. whom              B. which                C. who                  D. when

—Could I borrow your camera tomorrow?

—I don’t think you need it, because visitors ________ to take photos there.

A. aren’t allowed                                              B. don’t allow

C. haven’t allowed                                            D. hadn’t been allowed

In cities with rent control, the city government sets the maximum rent that a landlord  can charge for an apartment. The 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 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.

Some theorists argue that the minimum wage law can cause problems in the same way. The federal government sets the minimum that an employer must pay workers. The minimum helps people who generally look for unskilled, low-paying jobs. However, if the minimum is high, employers may hire fewer workers. They will replace workers with machinery. Therefore, other things being equal, the number of workers that employers want decreases. Thus, the critics hold the opinion that an increase in the minimum wage may cause unemployment. Some poor people may find themselves without jobs instead of with jobs at the minimum wage.

The supporters of the minimum wage say that it helps people keep their dignity. Because of the law, workers cannot sell their services for less than the minimum. Furthermore, employers cannot force workers to accept jobs at unfair wages.

Economic theory predicts the results of economic decisions such as decisions about farm production, rent 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.

71．This passage shows that setting maximum rent may ________.

A. encourage the construction of more apartments

B. reduce the shortage of apartments

C. discourage the renting of apartments as homes

D. result in a shortage of apartments

72．From the passage, we can infer that rent control ________.

A. is completely unnecessary              

B. will likely bring about undesired results

C. will bring positive effects in the long run       

D. is necessary under all circumstances

73．The problem of unemployment may come up when ________.

A. the minimum wage is set too low                B. the workers are unskilled 

C. the minimum wage is set too high               D. people need low-paying jobs

74．The passage is mainly about economists disagreement on ________.

A. the possible results of government controls

B. the urgency of getting rid of government controls

C. the relationship between supply and demand

D. the effectiveness of government controls

75．We can conclude from the passage that ________.

A. the results of economic decisions can always be predicted

B. predicting the results of economic decisions is something complicated

C. minimum wage can not protect employees

D. economists usually have the same prediction about an economic decision