单项选择题

A．Government of every nation with a small population.
B．Government of every country with a large population.
C．Government of a developed country.
D．Government of a developing country.
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单项选择题
A．It is compared with an operating room light.B．It is compared with a game.C．it is compared with a brain-drain machine.D．It is compared with a stimulation drug.
A．It is compared with an operating room light.
B．It is compared with a game.
C．it is compared with a brain-drain machine.
D．It is compared with a stimulation drug.
单项选择题
A．They detect nerve impulses transmitted to a grasshopper’s legs.B．They sense how far a grasshopper has jumped.C．They detect changes in air pressure.D．They help a grasshopper find food.
A．They detect nerve impulses transmitted to a grasshopper’s legs.
B．They sense how far a grasshopper has jumped.
C．They detect changes in air pressure.
D．They help a grasshopper find food.
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