B、basket=['apple','banana','apple','orange']fruit=set(basket)len(fruit) 的结果是5 C、basket=['apple','banana','apple','orange','melo']fruit=set(basket)len(fruit) 的运算结果是3 D、1=[2,1,3,5,4]remove(3)sort()则运算之后1为[1,2,4,5] ...