(单选题)
How did ponderosa pines adapt to droughts?
A.By closing the openings on their leaves.
B.By growing slowly with fat leaves.
C.By moving water inside their trunk quickly.
D.By reducing the length of their water vessels.
参考答案：A
参考解析：
细节理解题。根据文章第七段“The researchers found that the ponderosa pine used a strategy of ‘drought avoidance’ by conserving water, especially by shutting the tiny openings on its leaves to prevent water loss and slowing growth”可知，研究人员发现，黄松采取了一种通过保存水分来“避免干旱”的策略，特别是通过关闭叶子上的小孔来防止水分流失和减缓生长。A项是同义表达。故选A。
知识点：
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