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以下是某年全国资金流量表部分资料：

单位：亿元

请根据以上资料进行计算和分析判断，在下面备选项中选出正确答案。

设全国初次分配总收入为x亿元，则全国可支配总收入应为（）亿元。

A.x+9166

B.x+9166-8757

C.x+3700-3705

D.x+9166-8757+3700-3705

答案

参考答案：B

单项选择题

Until recently, most population growth has occurred in relatively dense urban environments. In (91) words, even if we were witnessing rapid population growth, that would not mean that the (92) were filling in with people. (93) , the urban areas would tend to become more crowded. Historically, we find that people have moved to (94) the jobs were. Jobs were usually in ports or locations with many natural (95) . After transportation became relatively cheap, other geographical locations became (96) of economic activity. One factor that determines where people will move to, even when transportation becomes cheap, is (97) . And individuals working in cities (98) higher incomes than those working in (99) areas. Hence, population has tended until the 1970s to (100) in our major urban centers. Recently population has (101) out of the Northeast to the South and to the West for the more pleasant climates. If people did not (102) from living in large cities, there would likely be a much more even population distribution (103) our entire land area. Probably, if this (104) the case, there would be less concern over population (105) Indeed, one need only (106) a cross-country drive or plane trip to realize how (107) populated these United States really are. This is not to say that we should or should not do something about (108) growth. The shortage of people in certain areas merely demonstrates that overpopulation in the United States is really only a problem in (109) urban environments. And this problem may be slowly correcting (110) .

A．was

B．were

C．wasn’t

D．weren’t
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单项选择题

关于对流性环流的发展，下述哪种情况是正确的（）.

A.因冷空气下沉而促使暖空气上升

B.暖空气密度小，自动上升

C.对流性环流周围的冷空气以较大的速度下降，因而迫使较暖的空气上升
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