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问题 单项选择题

与大气压力的产生关系最密切的是

A．基托面积
B．牙槽嵴高度
C．边缘封闭
D．后堤区宽度
E．粘膜厚度

答案

参考答案：C

解析：全口义齿只有达到边缘封闭，才能利用大气压力在基托与粘膜之间形成负压。

单项选择题

淋巴瘤骨盆野的外缘一般放在（）。

A.第4腰椎下缘椎体外缘2cm处与髂臼外缘连线，然后垂直向下

B.第4腰椎下缘椎体外缘与髂臼外缘连线，然后垂直向下

C.第4腰椎下缘椎体外缘内0.5cm与髂臼外缘连线，然后垂直向下

D.第4腰椎下缘椎体外侧2cm处与股骨头内缘连线

E.第3腰椎下缘椎体外缘2cm处与髂臼外缘连线，然后垂直向下
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单项选择题

According to the United States government, people are classified as homeless if they have no place to stay and no expectation of finding a place for the next thirty days, Although technically accurate, that is an impersonal assessment of an enormous and very human problem,
The homeless population represents all of us Americans, It includes men and women, the elderly, children, and infants. Its members are from all ethnic (种族的) groups. What they have in common is poverty.
Currently in the U.S., thirty-nine million people live in poverty. When money is really tight, paying the rent or buying food often becomes a choice. Government assistance in the form of food stamps does help but, as one homeless man explains, you can’t pay the rent with food stamps.
With no money for rent, the streets and homeless shelters become the alternative.

People become homeless for all the following reasons EXCEPT ______.
A. the lack of adequate education
B. the abuse of alcohol and drugs
C. the closure of institutions for the mentally ill
D. the poor performance of economy

Although men constitute the largest group within the homeless population, homeless women with children are rapidly joining them. In fact, one quarter of the homeless people in the U.S. are teenagers and young children.
People may become homeless for numerous reasons. However there are certain factors that many of these individuals have in common. They include a lack of adequate education and job skills. A majority of the teenagers and adults have not completed high school.
The abuse of alcohol and drugs is also a common factor. One third of the adult homeless population abuses alcohol, while one quarter of the same group uses drugs.
Some members of this population suffer mental health problems. Within the past several years many institutions for the menially ill have been closed and their patients sent "home". Unfortunately, a number of those people have no home to go to and they are unable to adequately look after themselves.
Job loss in today’s economy has also become a real factor in the loss of people’s homes. The breakup of families through abandonment and divorce are also contributing factors, particularly when there are children involved. The parent who is left to care for the kids with inadequate income may be forced to depend on the homeless shelters to put a roof over their heads.
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