A.
d={'wang':3000,'Niu':2000,'li':3500,'Tian':5000}
B.
d=dict([('wang',3000),('Niu',2000),('li',3500),('Tian',5000)])
C.
d=dict([['wang',3000],['Niu',2000],['li',3500],['Tian',5000]])
D.
d=dict([[['wang'],3000],[['Niu'],2000],[['li'],3500],[['Tian'],5000]])