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笫三部分  阅读理解（共20小题；每小题2分，满分40分）       阅读下列短文，从每题所给的A．B．C．D四个选项中，选出一个最佳选项，并在答题卡上将该项涂黑。                                  A     The key to happin,ess is how quickly you can get back your focus on, what's important． Anonymous Sixteen years ago I learned this lesson in the back of a New York City taxi carb． Here's what    happened． I hopped in a taxi, and we took ogfor Grand Central Station． We were driving in the    按照国际规定，船舶航行越过180度经线，日期一定要变化． ．