B．Summer is usually a very busy season.

　　C．You can arrange your time better this way.

　　D．Students usually book them to earn money.

　　8．The last paragraph tells us the advantages of hiring a motorhome by

　　.

　　A．telling us a story

　　B．giving detailed data

　　C．comparing it with flying

　　D．showing the results of a study

　　Ⅱ.七选五

　　Have you heard about leap year? Leap year is a year that has 366 days instead of the usual 365.It normally occurs every four years，always on an even­numbered year.The extra day is added to our shortest month.That is the second month of the year，which in non­leap years has 28 days，two fewer than any other month.

　　9

　　We also call leap year the bissextile year(闰年)．

　　10

　　In our calendar

　　system there is a need for a leap year because the solar year (the time it takes the earth to go around the sun once) is actually slightly more than 365 days long.That extra day—Feb 29 every four years—helps correct the difference between our calendar and the solar calendar.

　　It is said that leap year was first made part of the calendar by the ancient Roman leader Julius Caesar.His astronomers had calculated the length of the solar year to be 365 days and six hours.So Caesar declared that an extra day be added to the calendar.

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