单选题
{{B}}Directions:{{/B}} There are 5 reading passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C, and D. You should decide on the best choice and mark your answer on the ANSWER SHEET by blackening the corresponding letter in the brackets.

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.

单选题 Which one of the following years was a leap year?

【正确答案】 A

【答案解析】1880年是闰年，因为1880能被4整除，1894，1906年1926这三个数字均不能被4整除，因此1894年、1906年和1926年均不是闰年。

单选题 Which one of the following years will not be a leap year?

【正确答案】 D

【答案解析】2000既能被4整除，又能被400整除。因此，2000年肯定是闰年。2024年和2052均能被4整除，因此2024年和2052年均是闰年。3000虽然能被100整除，但不能被 400整除，因此3000年不是闰年。

单选题 How many leap years will there be in the decade commencing 1 January 2019?

单选题 Since 1582, the maximum number of leap years possible in any decade is ______.

【正确答案】 B

【答案解析】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。