已知字典 dict1={0:"zero",1:"one",2:"two",3:"Three"}， 执行语句dict1[3]="three"后， 字典 dict1 的内容为？ （ ）
{0:"zero",1:"one",2:"two",3:"Three"}
{0:"zero",1:"one",2:"two",3:"three"}
{0:"zero",1:"one",2:"two","3":three}
{0:"zero",1:"one",2:"two",3:"Three",3:"three"}