高等教育 /
(单选题) According to some scientists, many animals may be trained to do given jobs if they know ________.( )
A、who their trainers are
B、they will get a reward
C、they will be praised by their trainers
D、something dangerous will happen to them
A、who their trainers are
B、they will get a reward
C、they will be praised by their trainers
D、something dangerous will happen to them
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