What does the passage mainly discuss? The passage suggests that the speed at which communication through pheromones occurs is

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问题 What does the passage mainly discuss?
The passage suggests that the speed at which communication through pheromones occurs is dependent on how quickly they

选项 A、lose their effectiveness
B、evaporate in the air
C、travel through the air
D、are produced by the body

答案C

解析

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托福（TOEFL）

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What does the passage mainly discuss? The passage suggests that the speed at which communication through pheromones occurs is

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