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．Oil shortage.B．Large population.C．Air pollution.D．A large-scale war.
A．Oil shortage.
B．Large population.
C．Air pollution.
D．A large-scale war.
单项选择题
A．By making use of special paper.B．By adding common salt to silver.C．By making the temporary image.D．By using a special piece of metal.
A．By making use of special paper.
B．By adding common salt to silver.
C．By making the temporary image.
D．By using a special piece of metal.
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