英语周报答案2020～2021高一新课程

第三节One possible versionParagraph 1As the cashier put the DVD into a plastic bag, / walkeder to the younger woman. "Is that your mom? "I askedhalfway expecting her to tell me it was none of my businessBut she rolled her eyes and said, "Yeah. "I smiled toshow her I wasn't criticizing.Cherish her, "I said. Andn I answered her curious expression by saying, "Whenshes gone, it's the little moments like this that'llcomeack to you. " It was true. I missed my mother still andremembered the moments when I was so impatient as tomake her life miserableParagraph 2The elderly woman moved with her deliberate slownessback to her daughter. Together they made their way towardsthe exit of the video store. They stood there for a momentside bywaiting for the rushing holiday current and foin it. Then the daughter glanced over andmomentarily regarded her mother. And slowly, almostreluctantly, she placed her arm with apparently unaccus.tomed affection around her mother's shoulders and gentlguided her back into the deluge.

18.解:(1)由题得,f(x)3x2+2(1-a)x-a(a+2),又因为f(x)为偶函数,所以2(1-a)0,解得a=1.(5分)(2)因为曲线y=f(x)存在两条垂直于y轴的切线,所以f(x)=3x2+2(1-a)x-a(a+2)有2个零点即方程3x2+2(1-a)x-a(a+2)=0有两个不相等的实数根,所以A=4(1-a)2+12a(a+2)>0,即4a2+4a+1所以a≠所以a的取值范围为(-∞,-2)(-2+∞)(12分)

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