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问题 单项选择题 A1型题

慢性牙周炎（成人牙周炎）早期的特点为（）。

A.牙根暴露

B.多数牙齿松动

C.有根分叉病变

D.牙槽骨嵴顶吸收

E.经常发生牙周脓肿

答案

参考答案：D

解析：牙周炎具有四大特征，即牙龈炎症、牙周袋形成、牙槽骨吸收、牙齿松动移位。病变早期即可出现牙周袋和牙槽骨吸收，表现为牙龈红肿和牙菌斑，刷牙及进食时出血，常被患者忽视，延误治疗，使病情进一步加重；晚期可出现牙齿移位、食物嵌塞等。故选D。

填空题

尿红细胞形态检查________、________、________3种为肾小球性血尿红细胞特征形态。
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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.

20（）

A.receding

B.removing

C.invading

D.eroding
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