单项选择题

A．How grasshoppers find food.
B．How grasshoppers fight other insects.
C．How grasshoppers communicate with each other.
D．How grasshoppers escape from danger.
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单项选择题
A．In a park.B．At a garage.C．At a gas station.D．In an emergency room.
A．In a park.
B．At a garage.
C．At a gas station.
D．In an emergency room.
单项选择题
A．Agriculture.B．Transport system.C．Industry.D．National economy.
A．Agriculture.
B．Transport system.
C．Industry.
D．National economy.
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