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问题 单项选择题

目前，发展经济是中国和东盟各国最为关心的问题。由于地域和经济关系等因素，双方日益形成一种命运共同体，中国和东盟的战略伙伴关系进一步得到巩固。这说明（）

A.竞争、合作是国际关系的基本形式

B.主权国家是国际关系的主要参加者

C.维护国家利益是主权国家对外活动的目标和归宿

D.国际组织在国际社会中发挥着积极作用

答案

参考答案：C

单项选择题 A1/A2型题

以下哪一种为胰腺囊肿（）

A.先天性潴留性囊肿

B.增生性和寄生虫性囊肿

C.真性和假性囊肿

D.炎性囊肿

E.单纯性囊肿
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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.

Why does the author mention the Eastern Corridor and the California coast in Paragraph 4

A. As examples of megapolises.
B. Because 75 percent of the population lives there.
C. To conclude the passage.
D. The Bureau of the Census is located there.
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