由系统目标分解得到，仅适用于工程项目的某一方面的工程项目目标系统是（）。 A.功能目

农村集体资产按经济用途分为（）。

A.经营性资产

B.非经营性资产

C.资源性资产

D.无形资产

E.有形资产

某村调查饮用水含砷量平均浓度为0.21mg/L，轻度病人检出率为25%，中度病人为4%，重度病人为1%，该病村按分类标准应划为（）

A.轻病区

B.中病区

C.重病区

D.特重病区

E.高砷病区

The police still   haven't found the lost child, but they're doing all they  ____.    [ ]

A. can   

B. may    

C. must    

D. should

阅读理解。

     In cities with rent control, the city government sets the maximum rent that a landlord 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 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. The price, which is the wage that employers must pay, increases.

Therefore, other things being equal, the number of workers that employers want decreases. Thus, critics

claim, 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.

     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. Fconomists do agree, however, that there are

no simple answers to economic questions.

1. There is the possibility that setting maximum rent may _____. [ ]

A. cause a shortage of apartments

B. worry those who rent apartments as homes

C. increase the profits of landlords

D. encourage landlords to invest in building apartment

2. There is the possibility that setting maximum rent may _____. [ ]

A. cause a shortage of apartments

B. worry those who rent apartments as homes

C. increase the profits of landlords

D. encourage landlords to invest in building apartment

3. The problem of unemployment will arise _____. [     ]

A. if the minimum wage is set too high

B. if the minimum wage is set too low

C. if the workers are unskilled

D. if the maximum wage is set

4. The passage tells us _____. [ ]

A. the relationship between supply and demand

B. the possible results of government controls

C. the necessity of government control

D. the urgency of getting rid of government controls

5. Which of the following statements is NOT true? [ ]

A. The results of economic decisions can not always be predicted.

B. Minimum wage cannot always protect employees.

C. Economic theory can predict the results of economic decisions if other factors are not changing.

D. Economic decisions should not be based on economic theory.

污水管系的组成部分包括：（）

①、污水沟与污水井；

②、污水管路；

③、阀箱和污水泵；

④、泥箱和测量管

A.①、③、④

B.①、②、③

C.②、③、④

D.①、②、③、④