如下图所示,有甲、乙、丙共3支试管,先分别向各试管中加入2 mL可

如下图所示,有甲、乙、丙共3支试管,先分别向各试管中加入2 mL可溶性淀粉溶液,再按图中所示操作,其他条件均适宜,最后向甲、乙、丙的3支试管内分别加入稀碘液,会变蓝的试管是(  )

A.只有甲  B.只有乙

C.甲和乙  D.乙和丙

答案

D

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