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.
填空题
____________ will be one of the political initiatives taken to tackle the suicide problem in Australia.
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