下列试管中加入碘液后变成蓝色的是?

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下列试管中加入碘液后变成蓝色的是

①2ml淀粉溶液+2ml唾液,37℃,5min

②2ml淀粉溶液+2ml清水,37℃,5min

③2ml淀粉溶液+2ml稀释唾液,37℃,5min

④2ml淀粉溶液+2ml唾液,95℃,5min

⑤2ml淀粉溶液+2ml唾液+3滴盐酸,37℃,5min

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A.①②③

B.②③④

C.③④⑤

D.②④⑤

参考答案:

答案D