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问题 单项选择题

社会医学工作者认为，不同的家庭生命周期与不同的卫生保健问题相联系，因此把家庭生命周期划分为（）

A.结婚前、结婚后、生育、抚养、鳏寡五个阶段

B.结婚前、婚后无孩、生育、抚养、离巢五个阶段

C.结婚无孩、生育、离巢、空巢、鳏寡五个阶段

D.结婚无孩、生育、抚养、离巢、空巢五个阶段

E.结婚无孩、生育、抚养、离巢、鳏寡五个阶段

答案

参考答案：C

单项选择题

对牙周健康状况影响最大的不良习惯是

A．吸烟

B．喝酒

C．磨牙症

D．吐舌

E．口呼吸
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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 US 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 is the best title for the passage

A．Metropolitan Statistical Areas

B．Types of Population Centers

C．The Bureau of the Census

D．Megapolises
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