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问题 单项选择题 A1型题

下列病变符合亚急性重型肝炎的特点的是（）

A.肝细胞广泛变性及点状坏死

B.肝细胞弥漫性大片坏死，再生不明显

C.肝细胞弥漫性大片坏死伴结缔组织增生及肝细胞再生

D.肝细胞碎片状坏死伴结缔组织增生及肝细胞再生

E.肝细胞异型增生

答案

参考答案：C

解析：亚急性重型肝炎时肝体积缩小，包膜皱缩，质地软硬不一，局部可见大小不一的结节。镜下的特点是既有肝细胞的大片坏死，又有肝细胞结节状再生，可见明显的炎细胞浸润及结缔组织增生，常可转变为坏死后性肝硬化。

单项选择题

Until recently, most population growth has occurred in relatively dense urban environments. In (91) words, even if we were witnessing rapid population growth, that would not mean that the (92) were filling in with people. (93) , the urban areas would tend to become more crowded. Historically, we find that people have moved to (94) the jobs were. Jobs were usually in ports or locations with many natural (95) . After transportation became relatively cheap, other geographical locations became (96) of economic activity. One factor that determines where people will move to, even when transportation becomes cheap, is (97) . And individuals working in cities (98) higher incomes than those working in (99) areas. Hence, population has tended until the 1970s to (100) in our major urban centers. Recently population has (101) out of the Northeast to the South and to the West for the more pleasant climates. If people did not (102) from living in large cities, there would likely be a much more even population distribution (103) our entire land area. Probably, if this (104) the case, there would be less concern over population (105) Indeed, one need only (106) a cross-country drive or plane trip to realize how (107) populated these United States really are. This is not to say that we should or should not do something about (108) growth. The shortage of people in certain areas merely demonstrates that overpopulation in the United States is really only a problem in (109) urban environments. And this problem may be slowly correcting (110) .

A．population

B．education

C．people

D．culture
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单项选择题

同一直线上的正、反方位角的关系为( )。

A．αBA=αAB±90°

B．αBA=αAB±180°

C．αBA=αAB+90°

D．αBA=αAB+180°
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