单项选择题

What is the function of the sensory organs that the professor discusses

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 foo

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单项选择题

According to the professor, what cause the growth of the US economy about 200 years ago

A．The new technology used to build roads.
B．The ability to transport goods over land.
C．The trade in grain and cotton.
D．The linking of smaller local roads into one long roa

单项选择题

According to the professor, what determines the distance of a gross—hopper's jump

A．The number of impulses transmitted to the grasshopper's legs.
B．The age of the grasshopper.
C．The number of sensory organs the grasshopper has.
D．The size of the nerves that control walkin