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"}