单项选择题

A．He used to be a workman himself.
B．He likes to do repairs and make things himself.
C．He is a professional builder.
D．He paid workmen to decorate the house.
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单项选择题
One of the major difficulties of research into human health problems is the difficulty of ______.
A．knowing how many factors there are
B．isolating particular, individual factors from the complex human environment
C．knowing the complex human environment
D．increasing the number of the competent physicians
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