球会开拓市场的发展方向

试述元朝泉州港的兴盛和中外往来频繁的情况。

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在急性炎症中起关键作用的细胞是（）。

A.中性粒细胞

B.红细胞

C.NK细胞

D.巨噬细胞

E.嗜碱性粒细胞

2010年12月12日晚8时，为期16天的亚洲残疾人运动会在广州开幕。据此回答l~2题。

1、本届亚洲残疾人运动会开幕时，全球的昼夜（下图中阴影代表黑夜）分布状况大致为

A、A

B、B

C、C

D、D

2、运动会期间[ ]

A、澳大利亚混合农业区的牧民忙于剪羊毛

B、在黄河站（78°55'N）可欣赏到极光

C、北印度洋洋流呈顺时针方向流动

D、非洲大陆成群的野生动物大规模向北迁徙

American cities are similar to other cities around the world. In every country cities reflect the values of the culture. Cities contain the very best aspects of a society: opportunities for education employment and entertainment. They also contain the very worst parts of a society: violent crime, racial(种族) conflict and poverty. American cities are changing just as American society is changing.   　　

After World War II city residents became wealthier. They had more children. They needed more space. They move out of their apartments in the city to buy their own homes. They bought houses in the suburbs areas near a city where people live. These are areas without many offices or factories. During the 1950s the American “dream” was to have a house in the suburbs.

　　Now things are changing. The children of the people who left the cities in 1950s are now adults. They unlike their parents want to live in the cities. Many young professionals, doctors, lawyers and executives(主管人员) are moving back into the city. Many are single; others are married but often without children. They prefer the city to the suburbs because their jobs are there; they are afraid of the fuel shortage; or they just enjoy the excitement and opportunities which the city offers.

This population shift(转变) 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 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 for sure：many dying cities are alive again.

小题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.小题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.小题3:According to the 4^th paragraph, a great many poor people in American cities ___________. 

A．are faced with housing problems

B．are faced to move to the suburbs

C．want to sell their buildings

D．need more money for daily expenses小题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

未再生加氢催化剂卸剂时有哪些主要的注意事项？