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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.Preparing her seminar.B.Preparing her negotiation.C.Preparing her arguments.D.Preparing her show.

A.Preparing her seminar.
B.Preparing her negotiation.
C.Preparing her arguments.
D.Preparing her show.

单项选择题A.There are too many underdeveloped countries in the world.B.Underdeveloped countries have low level of industrial development.C.Different governments have different views on the question.D.Even developed countries have complex problems.

A.There are too many underdeveloped countries in the world.
B.Underdeveloped countries have low level of industrial development.
C.Different governments have different views on the question.
D.Even developed countries have complex problems.