河北保定2023-2024学年高三上学期开学考生物答案

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10.A【解析】由于点P是BC边上的一动点,且点P在x轴上,故设点P的坐标为(a,0);由于M(0,1)N(2,3),则直线MN的方程为y=x+1,点B为直线MN与x轴的交点,故点B的坐标为(-1,0);由于∠ABC为锐角,点P是BC边上的一动点,故a>1;所以线段MN的中垂线l1方程为y=-x+3线段MP的中垂线l2方程为y=ax-2a2+2;故△PMN的外接圆的圆心为直线l1与直线:的交点,联立解得x25+,即△PMN的外接圆圆心的横坐标为2(1+a5∵△PMN的外接圆与边BC相切于点P边BC在x轴上,则△PMN的外接圆圆心的横坐标与点P的横坐标相等,即1+a=a,解得;a=6-1或√-1(舍),所以点P的坐标为(√6-1,0).故

18.解:(1)因为等腰直角三角形ABC的斜边AB所在直线方程为y=2x-5,设CH的斜率为kH,则kx=-2,CH经过点C(1,2所以la:y-2=-2(x-1),ln:x+2y-5=0(4分)(2)d=r=ch2-2-52x-5,解得x+2y-5=0所以圆心H(3,1),所以等腰直角三角形ABC的外接圆的标准方程为(x-3)2+(y-1)2=5(8分)(3)经判断,AC,AB斜率均存在,设lk:y-2=k1(x-1),即kx-y+2-k1=0,因为H到直线AC的距离为yr,所以一3k-1+2-k1√2k十√5,解得k=-或k因为A点在B点上方,所以la:y3(12分)

20.【答案】红色旅游资源丰富,红色文化深厚;(2分)森林公园多,生态环境优美;(2分)位于中部地区,距离东部客源市场近;(2分)国家支持大别山红色旅游资源开发,政策优势明显(2分)大别山范围广阔,可开发资源多旅游承载量大(2分)

21.【答案】特征:PM2.5浓度以胡焕庸线为界,呈现明显的两极分化,其中东南地区主要为PM2.5浓度高值区,西北地区为低值区;(2分)高值区集中分布在山东半岛、中原、长三角、长江中游城市群以及京津冀东南部。(2分)措施:加大科技投入,减少工业生产污染物排放;植树造林,提高植被覆盖率;改善能源结构,提高新能源比重;合理布局城市功能区,建设生态城市。(每点2分,任答其中三点即可,共6分)

【语篇导读】本文是一篇说明文。蜜蜂的大脑虽小,但却有着特殊的记忆能力。新的研究表明,蜜蜂能记住自己的快乐和痛苦的经历。这些记忆根据经历的好坏而分别储存在它们大脑的特定区域中。32.D细节理解题。根据文章第二段中的These memories are then stored in specific areasof their brains.,”可知,它们的这些记忆被储存在大脑的特定区域33.B细节理解题。根据第四段中的最后一句“ This discovery is striking given how smalltheir brains are.”可知,这项发现非同一般、引人注目是鉴于蜜蜂的大脑太小34.A主旨大意题。根据最后一段中的关键信息“,, the latest study provides new insightinto animal cognition. These findings can helpus. the latest findings demonstrate a link...知,本段主要叙述这项最新研究的意义及带给人类研究的帮助。35.C主旨大意题。文章前两段就提出新的研究发现:蜜蜂能记住自己的快乐和痛苦的经历,这些记忆根据经历的好坏而分别储存在它们大脑的特定区域中。故C项为最佳标题。【解题指导】标题( title)包括全文标题和语段」标题。标题是文章主旨大意的浓缩版,它具有针对性、准确性、概括性(或抽象性)、形象生动性等特点。所以主旨大意与标题还是有区别的。做这类题可通过筛选法和排除法来选择

Paragraph 1:Suddenly he heard a bird s wings beating the dry grass. Ben moved quickly towardthe sound and saw a colored head of a beautiful bird the bird did not move until Bencame close. Then it tried to fly away, but one wing was broken. Ben lifted the bird and heldit close against his body. The bird fought to escape, but soon lay quietly in Ben's armsBen decided to take the bird home and fix its broken wings so that it could fly again. Hewas almost through the woods when he heard the hunter behind him. It is mine!Paragraph 2:There was something threatening in the mans cool quiet voice. The hunter steppedcloser and said, "Give me that bird! " ben was frightened However when he saw the birdtruggling weakly and made a wild, strange noise, he knew he could never give this bird tothe hunter. This feeling gave Ben great strength, and he was no longer afraid. The woodswere strangely quiet. To Ben s surprise, the hunter slowly walked away. Ben carefullystudied the injured wing. He stayed with the bird, smoothing its feathers, delighted to seeit recovering slowly