单项选择题

A.Swarms
B.Herds
C.Flocks
D.Schools
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单项选择题
A.fly offB.swoopC.settleD.turn back
A.fly off
B.swoop
C.settle
D.turn back
单项选择题
A.in advanceB.ahead ofC.in front ofD.in front
A.in advance
B.ahead of
C.in front of
D.in front
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