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问题 单项选择题

关于慢性肾功能不全的治疗，正确的是

A．限制植物蛋白的摄入
B．酸中毒不严重时可口服碳酸氢钠
C．限制磷的摄入
D．发生蛋白质营养不良时可加用必需氨基酸
E．尽量少食含钾量高的食物

答案

参考答案：A,B,C,D,E

判断题

两药口服剂量相同，则血药浓度相同。
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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.

Which of the following are NOT considered important in defining an urban area

A．Political boundaries.

B．Transportation networks.

C．Social relationships.

D．Economic systems.
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