题目

如图，∠BCD=90°，AB∥DE，则∠α与∠β满足（ ） A．∠α+∠β=180°       B．∠β﹣∠α=90° C．∠β=3∠α            D．∠α+∠β=90° 答案：B— Have you packed ______ well? We are leaving for the airport now.—Yes, I am ready.A.everythingB.somethingC.nothing