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问题 单项选择题

患者，男，56岁，无明显诱因突然咯血入院，作CT检查如图，病变的肺叶（段）定位应为（）

A.右肺下叶内基底段

B.右肺上叶尖、后段

C.右肺中叶

D.右肺上叶前段

E.右肺下叶后基底段

答案

参考答案：C

解析：

横断面上右肺中叶在斜裂及水平裂之间，连续层面观察可确定病变位于右肺中叶。本例病变位于中叶且中叶萎陷。

多项选择题

按《建筑抗震设计规范》(GB 50011—2001)，下述对特征周期的叙述哪些是正确的( )

A．计特征周期的简称

B．震活动性重复周期 (D)
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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.

The underlined word "integrate" in Paragraph 3 is closest in meaning to ______.

A．benefit

B．define

C．unite

D．restrict
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