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【判断题】
黄色的3,5-二硝基水杨酸（DNS）试剂与还原糖在碱性条件下共热后，自身被还原为棕红色的3-氨基-5-硝基水杨酸。在一定范围内，反应液里棕红色的深浅与还原糖的含量成正比。A.
正确
B.
错误
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Leo has presented a self-sealing argument.
B.
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C.
Leo has presented a circular argument.
D.
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E.
none of the above
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B.
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C.
Binky has committed an ad hominem.
D.
Binky has refuted a straw man.
E.
none of the above
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