【单选题】The market for lawn services is perfectly competitive. Larry's Lawn Service cannot increase its total revenue by raising its price because ________.
A.
Larry's supply of lawn services is perfectly inelastic
B.
the demand for Larry's services is perfectly inelastic
C.
Larry's supply of lawn services is inelastic
D.
the demand for Larry's services is perfectly elastic
【单选题】下面代码实现的功能描述为 def fact(n): if n == 0: return 1 else: return n * fact(n - 1) num = eval(input("Please enter an integer: ")) print(fact(abs(int(num))))