小题1:F
小题1:B
小题1:A
小题1:C
小题1:D
小题1:前面是：That is the second month of the year, which in non-leap years has 28 days, two fewer that any other month．可知有2月29号是闰年。选F
小题1:前面的句子：Leap year is also called the bissextile year可知这是正式的说法。选 B
小题1:从前面的句子：So Caesar declared that an extra day be added to the calendar．可知是每四年有一次。选A
小题1:从前面的句子：By this system, century years such as 1700, 1800, and 1900 were not leap years, but the year 2000 was a leap year．可知这有点复杂，但很有用。选C
小题1:从But if they go strictly by the calendar, they have only one-fourth as many birthday celebrations as most people．可知是他们承认确实变老了。选 D