单项选择题

As the society has rigid social ______, everyone knows his role in the society.

A．hemisphere
B．contempt
C．controversy
D．hierarchy
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单项选择题
The shuttle exploded in the air suddenly and broke into ______ at once.
A．diversity
B．fragments
C．doctrine
D．drought
单项选择题
He was ______ by the noise outside yesterday evening and could not concentrate on his study.
A．pecked
B．oriented
C．perturbed
D．paddled
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