11

　　However，Caesar’s adjustment was not completely accurate because his astronomers’ year exceeded the true solar year by eleven minutes and fourteen seconds.By 1582，a difference of ten days had developed between the calendar year and the true solar year.To correct this error，Pope Gregory XⅢ ruled that every fourth year would continue to be a leap year except for century years that could not be divided evenly by 400.By this system，century years such as 1700,1800，and 1900 were not leap years，but the year 2000 was a leap year.

　　12

　　People born on Feb 29 celebrate their growing up a little differently from the rest of us.

　　13

　　But if they go strictly by the calendar，they have only one­fourth as many birthday celebrations as most people.

　　A．They acknowledge that they get older each year.

　　B．When you see Feb 29 on a calendar，you know that year is a leap year.

　　C．This is its formal，or scientific title.

　　D．This may seem complicated，but it works.

　　E．In a leap year，the extra day is added to the second month，giving it 29 instead of the usual 28 days.

　　F．The leap year was introduced in the Julian calendar in 46 BC.

　　G．This is done every four years.

　　加练半小时　英语答案精析

　　第13练　旅游与交通(一)

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