七上英语报纸答案2第九期2022

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【答案】士2k=入，【解析】因为向量a,b不共线，且(ka一4b)∥(a一kb),所以ka一4b=入(a一kb)=Aa一k入b,则解得一4=一k入，k=士2.

What next?I wondered.So tender were the pups that it was impossible for them to resist danger withouttheir mother's protection.Hence,I made up my mind to release her.But how?A good idea occurred to me.Iwent back to my truck and fetched an iron bar.Using a rock as the supporting point,I unlocked the chain and setthe wolf free.Realizing my rescue,the wolf kept still to cooperate.After gaining freedom,she howled at me withher head low,showing her gratitude.Then,the mother wolf led her pups to go forward,disappearing in the forest.Four years later,I returned to Coho Creek.The previous gold searching spot had been transformed into anatural wildlife reserve.As I paced,the sound of my footsteps was accompanied only by the gracefully wavingleaves.All of a sudden,a beautiful mid-sized pool came into my sight,with a group of wolves scattered around,licking water or lying on the grass leisurely.Noticing my approaching,the wolves gathered.I was seized by astrong sense of horror,my palms sweating.Meanwhile,a leading wolf came forward,howling at me with herhead low.The memory crossed my mind.It was the wolf that I saved years ago.Before long,she turned back,leading her offspring to the forest.How amazing to see them again!