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: