单项选择题

A．Swarms
B．Herds
C．Flocks
D．Schools
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单项选择题
How many reading rooms does the library have
A． Four.
B． Five.
C． Six.
单项选择题
A．being perchedB．perchingC．being perching.D．be perched
A．being perched
B．perching
C．being perching.
D．be perched
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