单项选择题

A．The survey received a low rate of return.
B．The sample selected was not representative.
C．The questionnaires were too difficult.
D．The results of the survey were against the public opinion.
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单项选择题
A．Professor and student.B．Classmates.C．Customer and shop assistant.D．Colleagues.
A．Professor and student.
B．Classmates.
C．Customer and shop assistant.
D．Colleagues.
单项选择题
According to the passage, the worst case that revealed the fatal side effects of the pills is ______.
A．82 patients on fen-phen have suffered heart trouble
B．a woman patient on fen-phen died of hypertension
C．the diet pills cause brain damage
D．7 patients who had taken Redux developed heart defects
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