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The calendar used in Australia and in most other countries was introduced by Pope Gregory XIII in 1582. It provides for 366 days
The calendar used in Australia and in most other countries was introduced by Pope Gregory XIII in 1582. It provides for 366 days
admin
2013-01-12
37
问题
The calendar used in Australia and in most other countries was introduced by Pope Gregory XIII in 1582. It provides for 366 days in those years for which the year number when divided by 4 gives a whole number (i. e. without a remainder), those years are called leap years. All other years have 365 days. The Gregorian calendar further specifies that years whose year number is divisible evenly by 100 are not leap years, unless the year number is also divisible by 400.
In a leap year February has 29 days, whereas in a non-leap year it has 28 days.
A decade is a 10-year period, such as I January 1885--31 December 1894.
Since 1582, the maximum number of leap years possible in any decade is ______.
选项
A、2
B、3
C、4
D、5
答案
B
解析
从1582年起,任何一个10年的闰年的最大数目是3。做此题可采取排除法,C和D肯定不对。4年为一个闰年,4个闰年需要16年时间,5个闰年需要20年时间,远远地超过了10年,因此很容易排除。考生可以这样推理:20年里必定有5个闰年,其中的一个10年只有两个闰年,另一个10年必定有3个闰年。因此,从1582年起,任何1个10年的闰年的最小值是2,最大值是3。
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