What does the passage mainly discuss? According to the passage, the meaning of a message communicated through a pheromone may

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问题 What does the passage mainly discuss?
According to the passage, the meaning of a message communicated through a pheromone may vary when the

选项 A、chemical structure of the pheromone is changed
B、pheromone is excreted while other pheromones are also being excreted
C、exocrine glands do not produce the pheromone
D、pheromone is released near certain specific organisms

答案A

解析

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托福（TOEFL）

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What does the passage mainly discuss? According to the passage, the meaning of a message communicated through a pheromone may

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