[单选题]

在Windows 7中可按ALT+（　）的组合键在多个已打开的程序窗口中进行切换。

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• ●    You can have egg      or hard-boiled.
• ●    A a rule, the buyer i reponible for        a hip or booking the hipping pace.
• ●    Good are carried by everal        of tranport--on road or rail, by ea or air.
• ●    — Hey, Derek, which do you think i harder to learn, marketing or deigning? —                       
• ●    You can _____ ome bottle of wine, or ome chocolate, or a bunch of flower.
• ●    A campu emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
• ●    —                   —  I mean the bet way i uing your own mobile phone or computer to operate it. 
• ●    Every child i unique. Don’t        him or her to other.
• ●    — May I ugget the ale tart on or about October 1? —                      .
• ●    Actually, buyer are the group of people          want to buy certain good or ervice.
• ●    Price may change quickly if upply or demand         .
• ●    — I wonder whether I could accept thi dicount or not. —