(单选题)
The willow tree described in the passage protected itself by ______.
A.growing more branches
B.communicating with birds and bees
C.changing its leaf chemistry
D.shaking caterpillars off
参考答案：C
参考解析：
细节理解题。根据第一段第四句“First a willow tree attached in the woods by caterpillars, changed the chemistry of its leaves and made them taste so terrible that they got tired of the leaves and stopped eating them.”可知，柳树通过改变叶子化学成分让毛毛虫不再吃叶子。故选C。
知识点：
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