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1.                  Without hearing a word of what is being said or shouted, an experienced trader on the floor of the stock exchange can listen to the hum of voices around them and tell what is happening.

(A) Without hearing a word of what is being said or shouted, an experienced trader

(B) Without hearing a word of what is being said or shouted, experienced traders

(C) Even though the person has not heard a word of what is being said or shouted, an experienced trader

(D) Even when the person has not heard a word that is being said or shouted, experienced traders（B）

(E) In spite of not hearing a word of what is being said or shouted, an experienced trader

A

请问A和B有什么区别

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