可产生外毒素的菌群：（）

A.宋内志贺菌 

B.福氏志贺菌 

C.鲍氏志贺菌 

D.痢疾志贺菌 

E.空肠弯曲菌

Mr.Smith is 70 years old.Every morning he goes to the park to exercise.He has good eating habits.He eats fruit and vegetables every day.He hardly drinks and never eats junk food.Sometimes he goes to the tea house or play chess with his friends.9.He always takes a walk in the graden in the afternoon.. 10.He goes to the library twice a month.Every night he watches TV for half an hour and he never goes to bed late.So he still looks young and is pretty healthy.

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