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问题 单项选择题

空间扩散是指源于一个特定地方的技术、发明、新产品、新现象等逐渐被其他地方接受采纳或应用的空间过程。空间扩散最典型的特点是（）。

A．扩散的强度随着空间距离的增加而衰减

B．扩散的强度随着空间距离的增加而增加

C．随机扩散

D．跳跃扩散

答案

参考答案：D

单项选择题

下列哪个世界文化遗产属于美国（）。

A.自由女神像

B.孟菲斯及其墓地金字塔

C.圣加尔修道院
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单项选择题

The development of e-commerce may well bring the world into a brand new era of "electronic currency". At the moment, (52) areas in Europe, the United States and Asia have already started studying the possibility of an electronic currency. Electronic currency is not only about currency. It (53) to an entire finance system on the Net. It includes a virtual numeric currency, an electronic system of withdrawals, transfers and loans, and (54) cards of all shapes and sizes. The (55) of an electronic currency system implies the emergence of "virtual banks" and "virtual enterprises". Actually, the first virtual bank appeared in the US in 1995. (56) it is a small and insignificant bank, it represents the trend of the future. In time to come, we may even have to (57) the familiar paper currency.

As the Net pushes the economy (58) rapidly, the economy is also bringing the Net market forward, resulting in the Internet itself becoming the world’s largest emerging market. Of course, this is just the beginning. Although there are many companies which made huge profits (59) in the Internet market, they tend to be small companies. To date, most companies are making losses. The competition in the knowledge-based economy will also be more (60) This will definitely promote (61) and more efficient cooperation.

52().

A.developing 

B.building 

C.built 

D.developed
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