I didn’t like the story, ______ , it’s too long, also it was written by a writer I don’t know

A．for one thing

B．for a thing

C．although

D．in one hand

在叶绿体中色素的提取和分离试验中，滤纸条上会出现四条宽窄颜色不同的色素带，由上到下依次是（）

①叶绿素a②叶黄素③叶绿素b④胡萝卜素

A.①②③④

B.②④①③

C.④②①③

D.②④③①