单项选择题

A．Psychologists do not yet know how people see.
B．The best experiments are those in which all factors are controlled.
C．The study of perception is going on now.
D．Perception does not involve psychological factors.
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单项选择题
A．The porcupine in Southeast Africa lives mainly on worms.B．Hibernating animals are active in summer.C．When the animal is in its aestivating state, its body temperature doesn’ t drop.D．The body temperature of an aestivative animal doesn’t drop in winter.
A．The porcupine in Southeast Africa lives mainly on worms.
B．Hibernating animals are active in summer.
C．When the animal is in its aestivating state, its body temperature doesn’ t drop.
D．The body temperature of an aestivative animal doesn’t drop in winter.
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