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
单项选择题
A．He is confident.B．He is worried.C．He is bored.D．He is angry.
A．He is confident.
B．He is worried.
C．He is bored.
D．He is angry.
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