单项选择题

The best title for this passage might be ______.

A．Diversity and Unity
B．Diversity versus Unity
C．Psychology in Diversity
D．Professional Diversities
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单项选择题
It is implied in the last paragraph that ______.
A．prescribing the medication needs the identified criteria
B．the absence of the practitioners is a serious obstacle
C．the presence of more practitioners is a new problem
D．identifying the practitioner is of great importance
单项选择题
The main idea of the passage might be ______.
A．the knowledge-based industries in developing countries
B．the economical competition home and abroad
C．the further considerations of the World Bank
D．the 'knowledge gap' between rich and poor countries
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