The prototyping method is a dynamic design process,which requires people who use prototyping method to have the following capability of

A． proficient program expertise

B． immediately acquire requirement

C． coordinate & organize eloquently

D． handle tools smartly

秋季一些植物的叶子会变红，主要是因为这些植物的叶子中含有大量（）

A、叶绿素

B、叶黄素

C、花青素

D、胡萝卜素