3.D【解析】如图所示,由三视图可知该几何体为四棱锥A-BCDE其中,AC⊥平面BCDE,AC=CD=DE=2,CB=1,∴AB=√2+12=√5,BE=√2+1=√5,AD=√2+2=22,则AE=√(2√2)2+2=2√3.∴该几何体最长棱的长度为2√3.故选D

第四部分写作节The apple trees have a got! harvest in QingshanVillage, which is located near the drinking water soureearea. The speeial condit ions contribute to the apples'goouality-lig in size, retl anel lasty. The green farmingme thoIs guarantee their nutrition and keep the apples fretIron any pollution.The price ranges from S I per Iund to S 1.. perpoundI. varying from its variety, not expensive butreasonal.le The more you order, the more discount youenjoy. We prommise to pay . of delivery fee and yourenquiry will receive our timely responseL. king forward to your purchase now.

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