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Strangethingshappentotimewhenyoutravelbecausetheearthisdividedintotwenty-fourzones（时区）,onehourapart（一个时区相差一个小时）．Youcanhavedayswithmoreorfewerthantwenty-fourhours,andweekswithmoreorfewerthansevendays．

Ifyoumakeafive-daytripacrosstheAtlanticOcean（大西洋）,yourshipentersadifferenttimezoneeveryday．Asyouentereachzone,thetimechangesonehour．Travelingwest,yousetyourclockback,travelingeast,yousetitahead．Eachdayofyourtriphaseithertwenty-fiveortwenty-threehours．

IfyoutravelbyshipacrossthePacificOcean（太平洋）,youcrosstheInternationalDateLine（国际日期变更线）．Byagreement,thisisthepointwhereanewdaybegins．Whenyoucrosstheline,youchangeyourcalendaronefullday,backwardorforward．Travelingeasttodaybecomesyesterday．Travelingwest,itistomorrow．

根据短文内容选择最佳答案.

1．Strangethingshappentotimewhenyoutravelbecause______．

A．nodayreallyhastwenty-fourhours

B．nooneknowswheretimezonesbegin

C．theearthisdividedintotimezones

D．insomeplacesonedayalwayshastwenty-fivehours

2．Thedifferenceintimebetweenzonesis______．

A．onehour

B．morethansevendays

C．sevendaysD．twenty-fourhours

3．IfyoutravelacrosstheAtlanticOcean,goingeast,yousetyourclock______．

A．onehouraheadineachtimezone

B．onehouraheadforthewholetrip

C．onefulldaybackforeachtimezone

D．onehourbackineachtimezone

4．Fromthispassage,itseemstruethattheAtlantic______．

A．isinonetimezones

B．isdividedintotwenty-fourzones

C．isdividedintofivetimezone

D．isinfourtimezones

5．TheInternationalDateLineisthenamefor______．

A．thebeginningofanynewtimezone

B．anypointwheretimechangesbyonehour

C．thepointwhereanewdaybegins

D．theendofanynewtimezone