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.
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单项选择题
A．The professor is old.B．The professor is lazy.C．The professor is sick.D．The professor is only tired.
A．The professor is old.
B．The professor is lazy.
C．The professor is sick.
D．The professor is only tired.
单项选择题
A．To correct a common misunderstanding about grasshoppers.B．To help explain how well grasshoppers can jump.C．To compare the size of grasshopper with that of other insects.D．To show how quickly grasshoppers respond to danger.
A．To correct a common misunderstanding about grasshoppers.
B．To help explain how well grasshoppers can jump.
C．To compare the size of grasshopper with that of other insects.
D．To show how quickly grasshoppers respond to danger.
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