单项选择题

A．Agriculture.
B．Transport system.
C．Industry.
D．National economy.
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单项选择题
A．Children’s IQ and TV.B．The time children spend watching TV.C．The effect TV has on learning.D．The amount of time the average child spends watching TV.
A．Children’s IQ and TV.
B．The time children spend watching TV.
C．The effect TV has on learning.
D．The amount of time the average child spends watching TV.
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.
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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