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【单选题】
碳水化合物是人体热能的重要来源,占人体每日所需热能的百分比是( )。
A.
20%~25%
B.
40%~50%
C.
60%~70%
D.
80%~ 90%
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B.
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B.
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C.
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A.
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B.
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C.
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