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【单选题】
下列对的描述正确的是（）。A.
落叶乔木，树冠伞形
B.
树皮灰白色，呈不规则纵裂
C.
叶条状披针形，叶面暗绿，叶背粉绿
D.
种子卵形，成熟时鲜黄色，着生于紫色肉质膨大的种托上
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【单选题】DNA 与RNA 完全水解后产物的特点是()。
A.
核糖相同、碱基小部分相同
B.
核糖不同、碱基相同
C.
核糖相同、碱基不同
D.
核糖不同、碱基不同
E.
以上都不对
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