2. 外语
  3. What does the passage mainly discuss? Pheromone systems are relatively complex in insects that

What does the passage mainly discuss? Pheromone systems are relatively complex in insects that

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问题  What does the passage mainly discuss?
  Pheromone systems are relatively complex in insects that
选项 A、also communicate using sight and sound
B、live underground
C、prey on other insects
D、live in organized groups
答案D
解析
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