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.

17.A〖解析】对地球和月球组成的双星系统,有M2n1=m02r2,n+7=L=60R地,M=81m,解得n=4≈304700km,即共同引力中心点位于地表以下约1700km处,故选A项

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