大肠埃希菌是人体肠道正常菌群的一部分,每1克粪便存在( )

A、10[img=~\/QImg\/2013-06-26-17-11-54\/image034.gif]~10[img=~\/QImg\/2013-06-26-17-11-54\/image035.gif]个细菌
B、10[img=~\/QImg\/2013-06-26-17-11-54\/image035.gif]~10[img=~\/QImg\/2013-06-26-17-11-54\/image036.gif]个细菌
C、10[img=~\/QImg\/2013-06-26-17-11-54\/image037.gif]~10[img=~\/QImg\/2013-06-26-17-11-54\/image004.gif]个细菌
D、10[img=~\/QImg\/2013-06-26-17-11-54\/image005.gif]~10[img=~\/QImg\/2013-06-26-17-11-54\/image037.gif]个细菌
E、10[img=~\/QImg\/2013-06-26-17-11-54\/image038.gif]~10[img=~\/QImg\/2013-06-26-17-11-54\/image039.gif]个细菌