单项选择题

During the early years, people were never shut out by doors because （）

A．they were neighbors
B．they were friends
C．they depended upon each other
D．they got accustomed to that

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单项选择题
Psychologists study perception by（）

A．setting up many experiments
B．asking each other what they see
C．looking out of the windows
D．studying people’s eyes
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