2022-2022年英语周报高一课标第9期答案

第四部分写作第一节Last week our school held the Sports Week. We hade: lots of activities, such as running, hiking, and many kindsof ball games. We even had an exciting two-day sportsmeeting.Nowadays students are busy with their studies anddont get much exercise. This really worries our schoolauthority. So our school started the Sports WeekThe Sports Week proves to be a great success. It notonly builds up our bodies, but trains our characters aswell. Without health, there is no real happiness in life. Weshould work out regularly to keep fit.

20.【解析】(1)当k=一时,直线1=-3x+3,即(0,3)为椭圆C的上顶点,故b=,由半焦距c=1,则a=√③=2,故椭圆C的方程为C1+=1…………1分=k:(x-1)(2)设A(x1,y1),B(x+y),联立+2-1去得(3+)一一1=0一+0,x1+x8是3+423+4,则AB=√①+灯1x1-x112(H+1)8分3+4y=k:(x-4)设E(xy1),F(x4,y,),联立31去y得+一3==0,△=1414-了chys23+44………………………………9分则GE·1GF1=(1+41)(4-x2)(4-x)=(1+)[1-4(x1+x,)+13+“10分36(1+由GE·1GF=31AB得36(1+3+436(k+13+4,即一=0,因为k≠k,故k+=0.……12分解析】(1)函数1(x)的定义域为(0,+

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