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患者男性，41岁，因“刷牙出血4年，伴后牙咬合无力”来诊。口腔检查：牙石指数3，牙龈充血水肿，质松软，多数牙牙周袋4～7mm，牙松动Ⅰ度。X线片：多数牙牙槽骨水平吸收至根1/2。

关于该病，叙述错误的是（）

A.老年人发病率高于年轻人

B.男女发病率相同

C.该病具有部位特异性

D.该病具有牙位特异性

E.吸烟是其独立危险因素

F.宿主易感性在其发生发展中起重要作用

答案

参考答案：B

解答题
已知：关于x的方程x2-（k+1）x+
1
4
k2+1=0的两根是一个矩形两邻边的长．
（1）k取何值时，方程有两个实数根；
（2）当矩形的对角线长为
5
时，求k的值．
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单项选择题

In the United States, older people rarely live with their adult children. But in many other cultures children are expected to care (1) their aged parents. In some parts of Italy, the percentage of adult children who (2) with their parents (3) 65 to 70 percent. In Thailand, too, children are expected to take care of their elderly parents; few Thai elderly live (4) . What explains these differences in living arrangements (5) cultures Modernization theory (6) the extended family household to low levels of economic development. In traditional societies, the elderly live with their children in large extended family units for economic reasons. But with modernization, children move to urban areas, leaving old people (7) in (8) rural areas. Yet modernization theory cannot explain why extended family households were never common in the United States or England, or why families in Italy, which is fully modernized, (9) a p tradition of intergenerational living. Clearly, economic development alone cannot explain (10) living arrangements. Another theory associated intergenerational living arrangements with inheritance patterns. In some cultures, the stem family pattern of inheritance (11) . (12) this system, parents live with a married child, usually the oldest son, who then (13) their property when they die. The stem family system was once common in Japan, but changes in inheritance laws, (14) broader social changes brought (15) by industrialization and urbanization, have (16) the (17) .In 1960 about 80 percent of Japanese over 65 lived with their children; by 1990 only 60 percent did-a figure that is still high (18) U.S. standards, but which has been (19) steadily. In Korea, too, traditional living arrangements are (20) : the percentage of aged Koreans who live with a son declined from 77 percent in 1984 to 50 percent just 10 years later. Although most elderly Koreans still expect to live with a son, their adult children do not expect to live with their children when they grow old.

2（）

A.reside

B.recite

C.redeem

D.rebel
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