(单选题)
According to the passage, the willow tree was able to communicate with other trees by ______.
A.waving its branches
B.giving off a special smell
C.dropping its leaves
D.changing the color of its trunk
参考答案：B
参考解析：
细节理解题。根据第一段最后一句“Then even more astonishing, the tree sent out a special smell—a signal causing its neighbors to change the chemistry of their own leaves and make them less lasty.”可知，柳树向周围的树散发一种特殊的气味来发出信号。故选B。
知识点：
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