2023年广东一模历史答案

第一节短文改错(共10小题,每小题1分,满分10分)Michael. who now studied in our school. is my good friend. On the morning of laststudiesSaturday he asked me A spend the weekend together with himself. It was such fine weatherhimthat we had decided to hang around in the town. There were lots of pcople walk hereand there. Michael looked interesting in everything he saw. Three hours went by before weinterestedboth felt hungrily. but all the restaurant were full of guests. To our excitement. we werehrestaurantsabout to give up while two guests rose and left. We immediately sat down for our lunchhenand about an hour later we took the taxi home

9BD【解析】对于A圆方程可化为(x+号)+(y=1y=r-2由于该方程表示圆,故一2>0解得m∈(-∞,-2)∪(2√2,十∞),故A错误;对于B,圆C的半径为1,圆心在第一象限,且与直线4x-3y0和x轴都相切,∴圓心的纵坐标是1,设圓心坐标(a,1),则1=5,又a>0,∴a=2,∴该圆的标准方程是(x-2)2+(y-1)2=1,故B正确;对于C,设k=,即kx-y=0,则圆的标准方程为x-3)2+(y-3)2=4,则圈心坐标为(3,3),径R=2,则圆心到直线的距离长≤R,即13二3≤2,即|3-3≤2+F,平得5-1+5≤0,解得9=2≤k9+2,故卫的最大值是9+2互,故C错误;对于D两圆方程相减,得圓C1和圆C2的公共弦所在直线方程为:8x+6y-46=0,即4x+3y-23=0.圆心C2(5,6)到直线4x+3y-23=0的距离d=145+3x6=23=3…∴圆G和圆C2的公共弦长AB|=2√一d=2√16-9=2√7,故D正确