问题
单项选择题
According to the Bureau of the Census, what is an urban area
A．A chain of adjacent cities.
B．An area with at least 50,000 people.
C．The 18 largest cities.
D．An area with 2,500 people or more.
答案
参考答案：D
解析：[分析] 细节题型。 答案出自第二段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。