英语周报 2018-2022 九年级 牛津 30答案

18.解:(1)y=x1r1-(x2)25,易知:次函数图象的对称轴是直线x-2.2分设f(r)-r1x1.则f(1)-f(5)-1./(2)-5.…4分又因为f()的定义域为1,1,值域为5,11所以2≤5,即,A=2.51.…6分(2)因为“∈B”是“x∈A”的充分不必要条件,所以BsA8分1≥2可得解得1≤a≤11分+1≤5所以实数a的取值范用为1..…12分

【参考范文】One day, Spotty returned from his daily walk with a broken leg. Appearing exhausted, he came to myroom and sat near me, the leg bleeding. I called my mother and she quickly tied a bandage around his leg andgave him food to eat. I was very upset. But the next day, Spotty followed me wherever I went happily asusual though he limped a bit. After this incident my relation with Spotty became more intense. I reallyadmired him a lot for his courageAlmost a year later, one midnight we heard Spotty barking breathlessly. We rushed out and saw himbarking continuously, heading somewhere. After some time Spotty became quiet. I patted him on his backand came inside. The next morning, my heart skipped a beat when I didn't see Spotty. I searched for him ineach and every corner but in vain. And this time he had gone and would never come back. I cried and waitedfor him. But there were no signs of him and I only say him looking at me with his sparking eyes in my dream

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