单项选择题

A．In the early 1810s.
B．In the early 1820s.
C．In the early 1830s.
D．In the early 1840s.
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单项选择题
A．When they wanted to kill an enemy.B．When they wanted to identify a stranger.C．When they wanted to tell the time of the day.D．When they wanted to send a message to a person far away.
A．When they wanted to kill an enemy.
B．When they wanted to identify a stranger.
C．When they wanted to tell the time of the day.
D．When they wanted to send a message to a person far away.
单项选择题
A．A comparison of unconscious behavior patterns.B．Recent trends in psychology.C．Reasons for certain behavior problems.D．Causes of anxiety.
A．A comparison of unconscious behavior patterns.
B．Recent trends in psychology.
C．Reasons for certain behavior problems.
D．Causes of anxiety.
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