单选题:根据以下材料,回答题A.苷元-(2,6-二去氧糖)x-(D-葡萄糖)yB.若元-(2,5-二去氧糖)x-(D-葡萄糖)y

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题目内容:
根据以下材料,回答题
A.苷元-(2,6-二去氧糖)x-(D-葡萄糖)y
B.若元-(2,5-二去氧糖)x-(D-葡萄糖)y
C.苷元-(6-去氧糖)x-(D-葡萄糖)y
D.苷元-(2-去氧糖)x-(D-葡萄糖)y
E.苷元-(D-葡萄糖)y
Ⅰ型强心苷结构为(  )。
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