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【单选题】
某森林公园的一项研究试图确定成年松树的高度。该研究需要从中随机抽取 250 棵成年松树并丈量它们的高度后进行分析。该研究所感兴趣的变量是( )A.
森林公园中松树的年龄
B.
森林公园中松树的高度
C.
森林公园中松树的数量
D.
森林公园中树木的种类
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