英语周报 英语 2022-2022 八年级新目标答案

8.【解析】(1)如图,连接AC交BD于点N,连接MN,因为平面PAC∩平面BDM=MN,PA∥平面BDM所以PA∥MN所以2分又因为△BCN△DAN所以BC=2,故4分2)根据题意,取AD的中点O,连接PO,因为△PAD为等边三角形,所以PO⊥AD,PO=√35分因为平面PAD⊥底面ABCD,且平面PAD∩底面ABCD=AD所以PO⊥平面ABCD7分设△PAD的重心为G,则GO⊥平面ABCDAG=DG= PG=8分解等腰梯形ABCD,可得O为梯形ABCD外接圆的圆心,所以OD=OA=OB=OC=1,所以GD=GA=GB=GC=10分故G为四棱锥P一ABCD外接球球心,半径为

第二节(满分25分)One possible versionSuddenly I missed a step and fell into the pool. I was extremely scared, struggling in thewater.Seeing what had happened, Jack swiftly reached out his right hand, but unfortunatelybeyond my reach. Then he immediately picked up a stick from behind and gave the other end tome. However, the bank of the pool was too slippery and I was too scared to move. Calm downGrab at it firmly! "Jack encouraged in a loud voice. With his help and all my strength, Isuccessfully got outThere was not much time left for the return trip. Afraid of missing the boat back, Jackdragged me to the pier in a hurry. Meanwhile, I was looking back once in a while for fear that abeast might catch us up. We managed to catch the return boat finally but I had not yet gol overthe scare. Frightened and tired as I was, I congratulated myself on returning safe and sound. Mbrother and I harvested a meaningful exploration and really spent a brand new weekend.

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