A. They could drive the insects away. B. They could keep the plants well-watered. C. They could make the plants grow faster. D. They could build devices to trap insects. 参考答案:D 答案解析:细节题。结合问题,当听到文章读到If he is right时,注意听下文的解释:他们能够通过模仿发出叫声的植物来给昆虫设下陷阱(they could build traps that imitate