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本文从以下几个角度介绍。

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4、[学科网]2025届高三4月大联考数学(新课标卷)试题


6、[学科网]2025届高三4月大联考数学(新课标卷)试题


“Actually many people have asked me to write an autobiography. I have been asked so many times already but I always felt that it was not the right time for me to sit down and give thanks for my life and also I did not think my life was so exciting anyway,” says Kan.
However, her publisher thought otherwise, telling her that since she lived through interesting times in China, and was both witness and participant (见证者与参与者), she should write the book as a historical record.
“All the things I have done—my successes and my failures — can be a good example to young people in particular. I think that’ s the main reason why I wrote the book,” says Kan, adding that the COVID-19 lockdown gave her the unexpected opportunity to do some thinking about her life.
In the book, Kan included a lot of pictures taken from her early life. By scanning a QR code (扫二维码), readers are also able to see video clips from the period. “I am a television person, so I thought these videos were a great way to connect with my readers,” she says.
When writing an autobiography, the biggest challenges are not only how to present one’s life, but also remembering it in the first place. To help with reorganising her story, Kan asked the many friends and workmates she made over the years to write down their memories of her from earlier times. So besides featuring Kan’s own words, the new books are also filled with those of her friends, which gave Kan a new understanding of herself.
4. What can we infer from the first two paragraphs
A. Kan once walked on the moon. B. Kan’s father’s words deeply influenced her.


5、[学科网]2025届高三4月大联考数学(新课标卷)答案


2、[学科网]2025届高三4月大联考数学(新课标卷)答案


6、[学科网]2025届高三4月大联考数学(新课标卷)答案


6、[学科网]2025届高三4月大联考数学(新课标卷)答案


4、[学科网]2025届高三4月大联考数学(新课标卷)试题


5、[学科网]2025届高三4月大联考数学(新课标卷)答案


①马鬃、尼龙中,灼烧后有烧焦羽毛气味的是 。
②下列聚丙烯塑料的性质与制作牙刷柄相关的是 (填字母)。
A.坚固耐磨   B.易燃   C.易加工
③制作牙刷柄材质的变迁,体现化学服务于社会可持续发展的理念是 (写出一点)。
(2)人体口腔的pH宜保持在6.6~7.1。若pH过低,会造成牙齿表面牙釉质损伤、细菌滋生。
①某学生早餐后15分钟内口腔中pH变化如图所示。该学生早餐后口腔的酸性 (填“增强”或“减弱”)。
②牙釉质的主要成分为羟基磷酸钙。这里的“钙”是指 (填“元素”或“单质”)。


动力电池
2024年9月1日,以“新质动力·创绿未来”为氢能是一种清洁能源,氢气的生产和储存是科学研究的重要方向。
目前制氢的方法主要有化石能源制氢、电解水制氢和乙醇裂解制氢等。由化石能源制得的H2中含有CO,利用液氮的低温可将CO液化分离,从而获得纯净的H2。电解法制氢的能量转化如图1所示,其中利用可再生能源制得的氢气称为绿色氢气。乙醇裂解制氢会受到反应温度、催化剂种类等多种因素的影响。图2为我国科研人员研究反应温度对Ni/C催化裂解乙醇产氢率的影响。
图1 图2
氢气的储存方法有物理储氢和化学储氢。中国科学家研究出镁基固态储氢技术:利用金属镁和氢气在300 ℃和高压条件下发生反应生成氢化镁(MgH2),实现了固态储氢。MgH2是氢能源汽车的供能剂,它能与水反应生成氢氧化镁,同时释放出氢气。
氢能源能有效减少CO2的排放,随着制氢与储氢技术的不断发展,氢能源作为一种理想的清洁能源,其发展前景可期。
依据文章内容回答下列问题。


3、[学科网]2025届高三4月大联考数学(新课标卷)答案