短文改错/Proofreading and error correction

It was the chance of a lifetime to win the first prize on the Story Writing Show. All I had to do was to write a story or present it. My teachers have been telling me how great my writing was. So if they had said was true, I would have a chance of winning the prize. What were better, I had useful help. There was Uncle Chen, gentleman living near my house, who was a very much famous writer. He agreed to reading my story and give me some advices on how to write like a real writer.

1（）

流式细胞仪采集的前向散射光信号反映

A．细胞的大小

B．细胞的多少

C．细胞内部结构的复杂程度

D．细胞表面的光滑程度

E．分选细胞的比例