单项选择题

"credentials" in the last paragraph refers to ______.

A．professional techniques
B．qualified certificates
C．personal qualifications
D．substantial formal education
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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
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
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