请阅读下列代码，①、②、③、④处的输出结果依次是？（  ）

class Fruit:

price=０

def __init__(self):

self.color='red'

country="China"

if __name__=="__main__":

print(Fruit.price)  #①

apple=Fruit()

print(apple.color)  #②

Fruit.price=Fruit.price+15

print( "apple's price:"+str(apple.price))  #③

banana=Fruit()

print ("banana's price:"+str(banana.price))  #④