以人年为单位计算的率为( ) A．发病率 B．发病密度 C．病死率 D．现患

与肌萎缩性侧素硬化相鉴别，脊髓空洞症的特点是（）

A.节段性分离性痛温觉缺失

B.肌束震颤

C.双手肌肉萎缩

D.MRI可显示空洞

E.锥体束症

安装钻探设备的基本要求有哪些？

Many immigrants(移民) to the United States find the decision to seek better lives for their families in America can have an unexpected and tragic consequence(后果). Deep differences with their children develop over language and culture.

“Many immigrants arrive here without much education. Their kids soon gain language skills and also street marts(耍时髦) on how to live in America, leaving the parents at a disadvantage,” Ileana , Roses, pastor of a Methodist church group operating in Virginia, said.

“Not only that but they find they cannot relate to children who quickly absorb American culture,” she said.

According to the US Census Bureau(人口调查局), the number of foreign born or first generation Americans reached 55 million last year, a record one in five of the total population.

A government survey of 922 immigrants in 2000 found that nearly 40 percent of those who had been in the United States for more than 15 years would still like to take English classes if they had the time.

Two thirds of low income households depended on their children for translation.

Psychologists(心理学家) and sociologists say parents can lose their position of authority(权威) in a family as a result and the effects of that can be far-reaching.

Children exposed to American pop culture that glorifies(颂扬) youth and sexuality(性感) often rebel when their parents try to impose the conservative values they brought with them.

“Americanization erodes(侵蚀) all important aspects of parenting,” said Richard Weissbourd, who teaches education at Harvard University.

“I feel a part of me is dying with my children. They don’t listen to my music. I have to play it on Sunday morning when they are not around,” said an immigrant.

小题1: What troubles the immigrant parents most is ___________.

A．that they can’t understand the English language

B．that they lose their position of authority in their families

C．that their children have lost sense of their own national values

D．how they can master the English language as soon as possible小题2:From the passage we can infer that the population of the states at present is about____.

A．275 million

B．220 million

C．255 million

D．smaller than 250 million小题3:Which of the following is true according to the passage?

A．All the immigrants had expected the troubles they would meet before they went to the US.

B．Two thirds of immigrant families are low income households.

C．American culture shows a spirit against conservative social and cultural values.

D．American pop culture puts the immigrant families at a disadvantage.小题4:Which of the following is probably the title of the report?

A．The Result of the US Census

B．The Differences Between Parents and Children in the US

C．The Troubles of the American Immigrants

D．Role Reversal(颠倒) Troubles Many Parents and Children

形成唇裂

A．上下颌突未联合或部分联合
B．一侧或两侧的球状突或上颌突未联合或部分联合
C．侧腭突和鼻中隔未融合或部分融合
D．前腭突与上颌突未能联合或部分联合
E．上颌突与侧鼻突未联合

牛的肾脏内没有（）。

A.肾皮质

B.肾髓质

C.肾盂

D.肾盏