单项选择题

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

A．History.
B．Ecology.
C．Psychology.
D．Sociology.
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单项选择题
A．themselvesB．friendsC．strangersD．others
A．themselves
B．friends
C．strangers
D．others
单项选择题
A．bestB．justiceC．fairD．worst
A．best
B．justice
C．fair
D．worst
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