单项选择题

Passage One Questions 11 to 13 are based on the passage you have just heard.

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．He arrived at the theater late.B．He left his watch in the theater.C．The production seemed much shorter than it actually was.D．He did not enjoy the production.
A．He arrived at the theater late.
B．He left his watch in the theater.
C．The production seemed much shorter than it actually was.
D．He did not enjoy the production.
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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