单项选择题

A．Prejudiced.
B．Enthusiastic.
C．Indifferent.
D．Objective.
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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．Grade all the homework.B．Clean the professor’’s office.C．Help the professor in the classroom.D．Sort all the documents.
A．Grade all the homework.
B．Clean the professor’’s office.
C．Help the professor in the classroom.
D．Sort all the documents.
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