辽宁省县级重点高中协作体 高二期中数学[8-m>0,所以解得m=-1;（10分）3-m+2=5，当C的方程为(x+1)²+(y+2)²=4时，若C与C外切，CC=√[-1-(-2)]²-m>0所以无解.。（12分）√8-m+2=1,综上可知m=-1.（13分）16.（1）证明：因为P为棱AC的中点，Q为棱AC的中点，所以AP//QC，AP=QC，则四边形APCQ为行四边形，所以PC// AQ.（2分）又PC面ABQ，AQ面ABQ，所以PC//面ABQ.（3分）如图，连接PQ，则AP//AQ，AP=AQ，所以四边形AAQP为行四边形，则PQ//AA，PQ=AA，又AA//BB，AA=BB，所以PQ//BB，PQ=BB，即四边形BPQB为行四边形，所以BP//BQ，（5分）又BP面ABQ，BQ面ABQ，所以BP//面ABQ.(6分）又BP∩PC=P，BP,PCC面PBC，所以面PBC//面ABQ.（7分）QB（2）解：以点B为原点，BA，BB，BC的方向分别为X,yZ轴的正方向，建立如图所示的空间直角坐标系，则A(1,0,0)，B（O,2,O)，A(1,2,O)，C(0,2,1)

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26.What can be inferred about Mohiuddin from paragraph 3?A.He solved many kinds of environmental problems.B.He considered learning more important than business.30.WhatC.He was willing to lose personal comfort for his goals.A.ThD.He sought advice from experts for developing his business.B.The27.How does Mohiuddin feel about the progress he has made?C.TheA.Confused.·B.Satisfied..D.TheC.Regretful.D.Challenged.31.What icA.WorA fin whale body that was washed ashore at San Diego's Pacific Beach was discovered tohave many bite marks from killer whales,which could have contributed to its death,Low leaccording to the National Oceanic and.Atmospheric Administration (NOAA).At first,broken bonNOAA researchers deemed the marks might be from sharks,but further analysis by experts“Child鼠showed that these were actually rake (marks,an unusual feature of killer whales,aschildren's cstated by NOAA spokesperson Michael Milstein.senior auth如While it is possible that killer whales played a role in the fin whale's death,NOAA hasMcQuehad broken邮not confirmed that they were the definitive cause.Milstein noted that there are documentedinstances where killer whales have chased fin whales,causing them to beach (children hacthemselves in attempts to escape.This suggests that killer whales could have influenced theto recover.长Professwhale's fate ()but there is no certainty that they were the direct cause of death.Care,said,Additionally,NOAA reported sightings of a group of about a dozen killer whales alongKIt is a vitamthe Southern California coast,including San Diego.Boaters in the area filmed footage of aneeded for mgroup of killer whales actively chasing and likely feeding on dolphins near Torrey Pines.Thisyour body de敬indicates that killer whales are currently active in the region and may take part in variousrepair.”predatory(捕食性的)behaviors..The stuc布The fin whale's body was discovered on December 10.Lifeguards spent the entire dayprevent fractitrying to drag the whale back out to sea,but despite their efforts,the body returned to shorechildren's fra阁at least once.The whale was observed bleeding from its side,and attempts to pull it awayyour child forusing a small boat connected to its tail were unsuccessful.Fin whales,which are the second-Vitaminlargest whale species on Earth after blue whales,are considered endangered and relatively feware particularinnumber.These whales can weigh up to100,000 pounds.NOAA highly values publicSunlightreports regarding stranded(搁浅的）)or injured sea animals..NOAA extremely appreciatesfresh air can dosuchreports and ecourage the public to provide information o how to report these32.What is paincidents NOAAsuthat itistimeorall toork together.A.The sid8.What does the derir1probably meC.The goo33.How doesA.Complained.B.Persuaded.A.It uncoveC.Believed.D.Advocated.B.It focuse2.What ou killer whales eateC.It offersA.Drag it to the shore.B.Hit it unexpectedly.D.It provideC.Attack it in a group.D.Chase it until it beached itself.【高二英语第5页（共10页）】

26.What can be inferred about Mohiuddin from paragraph 3?A.He solved many kinds of environmental problems.B.He considered learning more important than business.30.WhatC.He was willing to lose personal comfort for his goals.A.ThD.He sought advice from experts for developing his business.B.The27.How does Mohiuddin feel about the progress he has made?C.TheA.Confused.·B.Satisfied..D.TheC.Regretful.D.Challenged.31.What icA.WorA fin whale body that was washed ashore at San Diego's Pacific Beach was discovered tohave many bite marks from killer whales,which could have contributed to its death,Low leaccording to the National Oceanic and.Atmospheric Administration (NOAA).At first,broken bonNOAA researchers deemed the marks might be from sharks,but further analysis by experts“Child鼠showed that these were actually rake (marks,an unusual feature of killer whales,aschildren's cstated by NOAA spokesperson Michael Milstein.senior auth如While it is possible that killer whales played a role in the fin whale's death,NOAA hasMcQuehad broken邮not confirmed that they were the definitive cause.Milstein noted that there are documentedinstances where killer whales have chased fin whales,causing them to beach (children hacthemselves in attempts to escape.This suggests that killer whales could have influenced theto recover.长Professwhale's fate ()but there is no certainty that they were the direct cause of death.Care,said,Additionally,NOAA reported sightings of a group of about a dozen killer whales alongKIt is a vitamthe Southern California coast,including San Diego.Boaters in the area filmed footage of aneeded for mgroup of killer whales actively chasing and likely feeding on dolphins near Torrey Pines.Thisyour body de敬indicates that killer whales are currently active in the region and may take part in variousrepair.”predatory(捕食性的)behaviors..The stuc布The fin whale's body was discovered on December 10.Lifeguards spent the entire dayprevent fractitrying to drag the whale back out to sea,but despite their efforts,the body returned to shorechildren's fra阁at least once.The whale was observed bleeding from its side,and attempts to pull it awayyour child forusing a small boat connected to its tail were unsuccessful.Fin whales,which are the second-Vitaminlargest whale species on Earth after blue whales,are considered endangered and relatively feware particularinnumber.These whales can weigh up to100,000 pounds.NOAA highly values publicSunlightreports regarding stranded(搁浅的）)or injured sea animals..NOAA extremely appreciatesfresh air can dosuchreports and ecourage the public to provide information o how to report these32.What is paincidents NOAAsuthat itistimeorall toork together.A.The sid8.What does the derir1probably meC.The goo33.How doesA.Complained.B.Persuaded.A.It uncoveC.Believed.D.Advocated.B.It focuse2.What ou killer whales eateC.It offersA.Drag it to the shore.B.Hit it unexpectedly.D.It provideC.Attack it in a group.D.Chase it until it beached itself.【高二英语第5页（共10页）】