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女，22岁，体温38℃，3天后体温下降伴周身乏力、食欲减退、恶心、呕吐，近2天发现尿色深如豆油样，胆红素定量82μmol／L，抗HBs（+），抗HAVIgM（+），巩膜及皮肤中度黄疸，肝区轻度叩击痛，肝肋下1．0cm，质软，余未见异常。

从病原学诊断考虑为（）

A.急性甲型肝炎

B.急性乙型肝炎

C.急性丙型肝炎

D.急性丁型肝炎

E.急性戊型肝炎

答案

参考答案：A

单项选择题 A型题

下列哪种显微镜多用于检查不染色的活细菌和螺旋体的形态及运动进行观察（）

A.普通光学显微镜

B.暗视野显微镜

C.相差显微镜

D.荧光显微镜

E.电子显微镜
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单项选择题

The fact that most Americans live in urban areas does not mean that they reside in the center of large cities. In fact, more Americans live in the suburbs of large metropolitan areas than in the cities themselves.
The Bureau of the Census regards any area with more than 2,500 people as an urban area, and does not consider boundaries of cities and suburbs.
According to the Bureau, the political boundaries are less significant than the social and economic relationships and the transportation and communication systems that integrate a locale. The term used by the Bureau for an integrated metropolis is an MSA, which stands for Metropolitan Statistical Area. In general, an MSA is any area that contains a city and its surrounding suburbs and has a total population of 50,000 or more.
At the present time, the Bureau reports more than 280 MSAs, which together account for 75 percent of the U.S. population. In addition, the Bureau recognizes 18 megapolises, that is, continuous adjacent metropolitan areas. One of the most obvious megapolises includes a chain of hundreds of cities and suburbs across 10 states on the East Coast from Massachusetts to Virginia, including Boston, New York, and Washington D. C. In the Eastern Corridor, as it is called, a population of 45 million inhabitants is concentrated. Another megapolis that is growing rapidly is the California coast from San Francisco through Los Angeles to San Diego.

According to the passage, where do most Americans live

A．In the center of cities.

B．In the suburbs surrounding large cities.

C．In rural areas.

D．In small towns.
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