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  3. What does the passage mainly discuss? According to the passage, the highest amount of pheromone vapor is found

What does the passage mainly discuss? According to the passage, the highest amount of pheromone vapor is found

admin2005-01-30  32
问题 What does the passage mainly discuss?
According to the passage, the highest amount of pheromone vapor is found
选项 A、in the receptors of the ants
B、just above the trail
C、in the source of food
D、under the soil along the trail
答案B
解析
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