题目

阅读下列短文，从每题所给的四个选项(A、B、C和D)中选出最佳选项。 If cars had wings，they could fly and that just might happen，beginning in 2011.The company Terrafugia，based in Woburn，Massachusetts，says it plans to deliver its car­plane，the Transition，to customers by the end of 2011. “It's the next ‘wow' vehicle，” said Terrafugia vice president Richard Gersh.“Anybody can buy a Ferrari，but as we say，Ferraris don't fly.” The car­plane has wings that unfold for flying－a process the company says takes one minute－and fold back up for drivi一份稿件共4500字，小明录入了这份稿件的13，小东录入了这份稿件的15，两人一共录入了多少字两人一共录入了多少字？（在横线上提出一个两步计算的问题并解答）．