单项选择题


A．problems
B．credits
C．computers
D．benefits
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单项选择题
A．vacationsB．gamesC．mathD．solutions
A．vacations
B．games
C．math
D．solutions
单项选择题
If your jokes often find a ready echo in a person, you will learn through ______ that telling jokes to this person is fun, and you will try with greater efforts to be humorous in his presence.
A．classical conditioning
B．operant conditioning
C．neither of them
D．some other sorts of conditioning
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