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2024年2月海南省高三年级春季学期开学摸底联考数学.考卷答案试卷答案
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扎记EYoumayfeellikeyoudon'thavetimetomakeadjustments.F.NeitherextremewillleadyoutoapleasantlifeforveryongG.However,reevalationandgrowthbringamorebeautifulfuture【答案15~19DCGFB第三部分语言知识运用（共两节，满分35分）getthe第一-节（共20小题：每小题1分，满分20分）阅读下面短文，从短文后各题所给的A,B,C和D四个选项中，选出可以填人空白处的最佳选项
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20.B我看着他从口袋里掏出皱巴巴的作业递给我
21D他回答道：“我的作业
”22.B我很震惊，因此我很长时间说不出话来
◇金太阳AB创新卷·英语（滚动卷）2022.11.1117:48
分析（Ⅰ）求出C到直线x-y+5=0的距离，根据直线x-y+5=0与圆C相交所得弦长为$2\sqrt{2}$，利用勾股定理，即可求半径r；
（Ⅱ）由$|PO|=\sqrt{2}|PA|$可得（x-4）2+y2=8，所以只需要圆C和圆（x-4）2+y2=8有公共点．
解答解：（Ⅰ）C到直线x-y+5=0的距离为d=$\frac{|1-4+5|}{\sqrt{2}}$=$\sqrt{2}$，直线与圆相交所得弦长为$2\sqrt{2}$，所以$r=\sqrt{2+2}=2$．
（Ⅱ）设P（x，y），由$|PO|=\sqrt{2}|PA|$可得（x-4）2+y2=8，
所以只需要圆C和圆（x-4）2+y2=8有公共点，两圆圆心距离为5，
所以$5-2\sqrt{2}≤r≤5+2\sqrt{2}$．
点评本题考查直线与圆、圆与圆的位置关系，考查学生的计算能力，属于中档题．
