+2k+1-6k分(3k +1)4*-(6k +1)n=2k6k2k+1由此b=828
辽宁省县级重点高中协作体 高二期中数学OB√2ABCD内的射影为B0,所以PBO为侧棱与底面所成的角,且cOSPBO:PB2所以PBO=45°,故C不正确;因为PBO=45°,所以OPB=45°,即POB=45°,同理POD=45°,所以BO⊥OD,因为AC⊥面PBD,BO面PBD,所以AC⊥BO,又OD面ACD,AC面ACD,且BO=PB=2,故D正确.11.BD【解析】设C的焦距为2c,不妨设A(x,x)位于第一象限,则C4,由椭圆的对称性可知q+2√6,所以a=√6,则b=√3,所以C的方程为-=1,故A不正63确;因为c=√a²-b²=√3.即F(√3.0),所以点F关于l的对称点M(0,√3)为C的上顶点,所以S△MFFFF|×|OM|=3,故B正确;设△AFF的重心为G,则点G的坐标为,因为直线MF的方程为V==-x+√3,所以点G的坐标不满足直线MF的方程,即点G不在直线MF上,所以点N不是线段AF的中点,所以直线ON与直线AF不行,故C不正确;设与l行并与C相切的直线为l:y=x+t,因为C的方程为x+t代入C的方程,得3x²+4tx+2t²-6=0,由
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34.What do the study's authors advise parents to do?A.Eat vegetables as much as possibleB.Ask their family members to work out.C.Check vitamin Dlevels of their kids.D.Refuse dairy products in the supermarket.35.Which can be a suitable title for the text?A.Well-balanced Diets Help Teenagers Grow UpB.Exploring Nature Plays a Key Role in LifeC.Researchers Find a New Kind of VitaminD.Vitamin D Is Vital for.Children第二节(共5小题;每小题2.5分,满分12.5分)阅读下面短文,从短文后的选项中选出可以填入空白处的最佳选项。选项中有两项为多余选项。To some extent,smartphones are extensions (of our hands,but it's easy to forget howmuch time we actually spend on them.Here are ways for you to get rid of (this addiction.36.They keep us connected to friends,work,the news and funny videos.But whenyou start feeling anxious about not having your phone around,that's different.It's one thingto feel inconvenient,but it's another to feel really anxious.Is that the case with you?37If so,start slow.Try leaving your phone at home for short,controlled periods to take a quickwalk.Gradually,it's okay even without a phone for a long time.I found myself checking my phone from time to time.And what do I find?Nothing new.38.It's just the habit of checking for the sake of (checking.So,how have I beengetting rid of this habit?One strategy is to create some trouble.Set your phone to require a¥password to unlock rather than immediately open it through facial recognition.4If you find yourself pulling out your phone during dinner with friends,at family44gatherings,or even when someone is telling you something important,this might be a sign of汾phone addiction.39.That is,when I'm about to meet with friends,I set my phone to6“Do Not Disturb(千扰)”mode or put it on airplane mode..I've even left my phone in my bag.47.car,or another room just to break the constant desire to check it.It feels awkward at first.48.49.40·50.A.Here's a trick I've found helpful51.B.Our phones are necessary tools these days52.C.There's not any urgent task I need to handle53.4D.What can you do about it effectively and easily54.6E.You can set screen time limits on certnin apps to handle this situation55.AF.Do you want to feel more comfortable without your phone sometimesG.Actually,the conversations are more enjoyable without being disturbed【高二英语第7页(共10页)】

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