防止术后肺不张，下列哪项是错误的A．嗜烟者术前戒烟1d～2d B．术前控制呼吸道感染

莲鹤方壶

阅读理解。

     American cities are similar to other cities around the world: In every country, cities reflect the values of the

culture. American cities are changing, just as American society is changing.

     After World War Ⅱ, the population of most large American cities decreased; however, the population shifts

(转移) to and from the city reflect the changing values of American society. In the late 1940s and early 1950s,

city residents (居民) became wealthier. They had more children so they needed more space. They moved out

of their apartments in the city to buy their own homes. They bought houses in the suburbs (郊区).

     Now things are changing. The children of the people who left the cities in the 1950s are now adults. Many,

unlike their parents, want to live in the cities. They continue to move to Sun Belt cities and older ones of the

Northeast and Midwest. Many young professionals are moving back into the city. They prefer the city to the

suburbs because their jobs are there; or they just enjoy the excitement and possibilities that the city offers.

     This population shift is bringing problems as well as benefits. Countless poor people must leave their

apartments in the city because the owners want to sell the buildings or make apartments for sale instead of for

rent. In the 1950s, many poor people did not have enough money to move to the suburbs; now many of these

same people do not have enough money to stay in the cities.

     Only a few years ago, people thought that the older American cities were dying. Some city residents now

see a bright, new future. Others see only problems and conflicts. One thing is sure: many dying cities are alive

again.

1. What does the author think of cities all over the world? [ ]

A. They are alive.

B. They are hopeless.

C. They are similar.

D. They are different.

2. Why did American city residents want to live in the suburbs after World War Ⅱ? [ ]

A. Because older American cities were dying.

B. Because they were richer and needed more space.

C. Because cities contained the worst parts of society.

D. Because they could hardly afford to live in the city.

3. According to the 4th paragraph, a great many poor people in American cities _____. [ ]

A. are faced with housing problems

B. are forced to move to the suburbs

C. want to sell their buildings

D. need more money for daily expenses

4. We can conclude from the text that _____.[ ]

A. American cities are changing for the worse

B. people have different views on American cities

C. many people are now moving from American cities

D. the population is decreasing in older American cities

第五套人民币10元券背面三峡图右下岩壁上连续设有（）三个字母的暗记。

A.ZQM

B.WJM

C.MLQ

商圈是指一商业街的客户吸引力的所及范围或地域，确定和分析商圈的方法有如下几种（）。

A、利用政府商业部门通过调查而存有的现成资料

B、独立的调查

C、商圈的层次区分

D、商圈的区位

E、商圈的范围

乙炔管道不能与（）、（）敷设在单独的同一支架上。