单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Enthusiastic.
B．Reluctant.
C．Serious.
D．Cooperative
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填空题
Oskar Pfungst discovered that Hans performed badly in the math work when ______.
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.
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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