2024安徽江淮十校高三第一次联考物理参考答案

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6.C(解析::f(x)=e-2x-1,该函数的定义域为R,且f(x)=e-2,令f'(x)<0,可得x

13.D【解析】自由水是生化反应的介质,有些还直接作为反应物参与生化反应,如有氧呼吸;结合水是组成细胞结构的重要成分,能与蛋白质、多糖等物质结合,成为生物体的构成成分,而液泡中的水属于自由水;细胞中大多数无机盐以离子的形式存在,对维持细胞和生物体的生命活动有重要作用,能参与维持细胞的酸碱平衡,也能参与有机物的合成,如Mg2+是合成叶绿素的重要成分。故选D

10.A〖解析】线粒体是细胞的“动力车间”,根据细胞代谢的需要,线粒体可以在细胞质基质屮移动和增殖:细4胞质基质中含有RNA,不含DNA,而线粒体基质和叶绿体基质中含有DNA和RNA,可见,三者所含核酸的种类不同;内质网是蛋白质等大分子物质加的场所和运输通道,在未分化的细胞中数量较少,而胰腺外分泌细胞由于能合成并分泌含消化酶的胰液,细胞中的内质网数量较多;分泌蛋白是在附着在内质网上的核糖体上合成的,高尔基体与分泌蛋白的加、包装和膜泡运输紧密相关。故选A。

24.(1)受火山喷发影响,海湾封闭,与海隔绝形成咸水湖;(2分)咸水湖受河流及降水补给,加之圣胡安河流出到加勒比海,使湖水的盐度降低,逐渐变成淡水湖。(2分)(2)规律:尼加拉瓜湖水位年变化明显,5-10月水位高,12月到次年4月水位低。(2分)依据:湖区周围属于热带草原气候,5-10月为湿季,降水多,河流径流量大,水位高;12月到次年4月为干季,降水少,河流径流量小,水位低。(4分)(3)火山喷发时含有大量火山灰,火山灰为藻类提供了大量的营养物质,促进藻类生长;纬度位置低热量充足,藻类及鱼类生长快;湖区面积大,为鱼类生长提供了广的生存空间。(6分)(4)尼加拉瓜湖面广阔,为海水鱼提供了广阔的生存空间;尼加拉瓜湖曾是太平洋的一个海湾,海水盐度较高,适合海鱼生长,后因地质作用成湖.且湖水逐渐变淡,海鱼逐渐适应了淡水环境。(4分)【解析】第(1)题,尼加拉瓜湖位于南极洲板块与美洲板块的消亡边界,多火山、地震,因火山喷发,火山熔岩流堵截,而与外海隔绝而成湖;地表径流不断汇人湖泊,湖水上涨外泄入海,湖水盐度降低,日渐淡化,变成淡水湖。第(2)题,尼加拉瓜湖的补给主要来自降水,故其水位年变化规律与当地气候关联度高。由气候资料图可知,尼加拉瓜湖的水位年变化明显,5—10月水位高,12月到次年4月水位低。这是因为湖区周围属于热带草原气候,5-10月为湿季,降水多,河流径流量大,水位高;12月到次年4月为干季,降水少,河流径流量小,水位低。第(3题,尼加拉瓜湖渔业资源丰富的自然原因主要与湖区气候适宜、湖水中的营养物质多、湖区面积大有关。第(4)题,大型海鱼需要大面积生存空间,尼加拉瓜湖湖面广阔,为海鱼提供了广阔的生存空间;尼加拉瓜湖湖水由海水逐渐变成淡水,在湖水日渐淡化过程中,海鱼也适应了水的淡化存活下来。

Paragraph IJatin looked up and he saw the other boys rushingahead. Refusing to give up at this crucial point, Jatinclenched his teeth, jumped to his feet and ran as fast as hecould. Finally, he was the fourth one to dash across thefinish line. Jatin couldnt help sobbing at the thought ofletting his sister down. But much to his surprise, the run-ner who collided with him was disqualified for breaking therule and Jatin won the third prize. Jatin felt overjoyed andrelieved during the award ceremony, holding the shoesclose to his chestParagraph 2Filled writh pleasure, Jatin walked home in no timeHe could not wait to see his sister and share the good newsOn his arrival, Jatin found Neha was walking about outsidnervously and anxiously. " Neha, see what I have got foryou.Jatin said excitedly, taking the prize out of his bagwith his trembling hands. The instant Neha saw the shoesher face lit up. So thrilled was she that she threw herself atJatin."Thank you! Jatin. " Tears of joy welled up in theieyes as the brother and the sister hugged tightly together