2021-2022年英语周报高一课标第16答案

第二节One possible versionFinally, as his sob quieted, his mother pulled back to look athim. " Rex, take the bird to Mr. Blake and tell him what happened.You will never have peace if you dont face him. Mr. Blakedeserves to know the truth she said with a firm look. The walk toMr. Blake's house was difficult. Leaving his mother in the yardRex stepped to the front door with the dead turkey. He knockedhoping Mr Blake wouldnt answer. But the door openedHi, Mr: blake, Rex handed him the dead bird. When he toldthe whole story of how he killed the turkey by mistake, Rex lookedat the ground, too frightened to look up there was a momentssilence and then Mr. Blake said, Thats all right. We'll eat it fordinner today. A smile appeared on his face. Rex couldnt believewhat he had heard. As he ran home he felt as if a rock had beenlifted from his shoulders. He realized that doing the right thing wastruly easy in the end

22.(本小题满分10分)【选修4-4:坐标系与参数方程】解:(1)p=sin2O(p∈R)分p=sin20|(p≥0)P=sin 201sin20|=1→sin2b=±l,所以20=+m(kED,×A,取k=0,L,2,3,得O=,3x57~从而得到单位圆与四叶玫瑰线交点的极坐标为化成直角坐标就是A(5分)(2)直观发现,四叶玫瑰线关于直线y=x对称事实上,将极坐标方程p=sin20(p∈R)化作直角坐标方程得(x2+y2yx2+y2=2y,将x,y互换后方程不变,说明四叶玫瑰线关于直线y=x对称;将x换作一y,y换作-x后方程不变,说明四叶玫瑰线关于直线y=-x直线l的普通方程是x+y-2=0y=1+t直线l与直线y=x垂直,且玫瑰线在直线l的同侧,√√故MN的最小值等于点A,到直线x+y-2=0的距离22+22M……(10分)

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