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问题 单项选择题

布氏杆菌关节炎（）

A.易累及手、足的远端关节，末节指骨变尖，骨质硬化不明显

B.发病2～3个月后相邻椎体上下缘形成局限性骨质破坏，破坏区周围广发骨修复反应

C.椎体广泛变方，脊柱呈竹节状，椎间小关节强直

D.椎体边缘骨赘形成，无骨质破坏，椎间隙变窄

E.好发于承重大关节，骨质破坏早且中，伴有明显骨质硬化

答案

参考答案：B

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.

According to the passage, what is a megapolis

A．One of the 10 largest cities in the United States.

B．One of the 18 largest cities in the United States.

C．One of the 100 cities between Boston and Washington.

D．Any number of continuous adjacent cities and suburbs.
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单项选择题

无色透明有弹性，不含神经血管的结构是

A．角膜
B．虹膜
C．结膜
D．晶状体
E．玻璃体
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