单项选择题

Why are the Dry Valleys left bare

A．Vicious wind blasts the snow away.
B．It rarely snows.
C．Because of the global warming trend and fierce wind.
D．Sand dunes.
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单项选择题
Recorded history has taught us ______.
A．violence never solves anything
B．nothing at all
C．the bloodshed means nothing
D．everything
单项选择题
It can be inferred that truly reasonable men ______.
A．can't get a hearing
B．are looked down upon
C．are persecuted
D．have difficulty in advocating law enforcement
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