题目：有一对兔子，从出生后第3个月起每个月都生一对兔子，小兔子长到第三个月后每个月又生一对兔子，假如兔子都不死，用户输入一个大于2的月份数，计算输出该月的兔子总对数。
A. month = int(input()) a, b = 1, 1 for i in range(3, month + 1): b = a + b a = b - a print(b)
B. month = int(input()) a, b = 1, 1 for i in range(3, month + 1): b = a + b a = a - b print(b)
C. month = int(input()) a, b = 1, 1 for i in range(3, month + 1): a, b = b, a + b print(b)
D. month = int(input()) a, b = 1, 1 for i in range(3, month + 1): a = b b = a + b print(b)
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