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问题 单项选择题 A3/A4型题

女性，55岁。5年前患肺癌手术治疗，术后化疗半年余。半年前发现在左锁骨上淋巴结肿大，2个月来出现胸憋，气短而就诊，检验检查：Hb100g/L，WBC7×109/L，血沉40mm／第一小时末，X线胸片示左肺肿块阴影，心影向两侧扩大，心脏搏动减弱。

检查证实该患者心包呈中等量积液，该患者心脏积液最可能的病因是（）

A.结核病

B.肿瘤

C.心肌梗死后综合征

D.化脓性

E.非特异性

答案

参考答案：B

单项选择题

关于类风湿关节炎的描述，下列哪项不正确（）

A.是一种非特异性炎症

B.其发生与免疫机制和HLA-DB抗原有关

C.临床表现多为多发性和对称性关节炎

D.病程发展缓慢但有急性发作，逐渐形成关节畸形

E.与风湿性关节炎属同一疾病，只是好发年龄不同
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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 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.

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

A. benefit

B. define

C. unite

D. restrict
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