Once a man bought a parrot,but the parrot was very foolish.It could only speak nothing but :"Who are you?"one day,the man went out for business and left the parrot at home.At the moment,a man whose job was sending gas tank knocked the door ."DANG DANG DANG,is anybody at home?"The parrot said:"Who are you "The man answered:"I am the person whoose job is sending gas tank."The parrot continued to ask::"Who are you "The man answered:"I am the person whoose job is sending gas tank."The parrot always asked the same question till the host came back.He saw a man laid down on the ground and spuring foam from the mouth.So he said:"Who are you "The parrot answered:"I am the person whoose job is sending gas tank."