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4、拉萨市2025-2026学年上学期高三第一次联考政治试题


1、拉萨市2025-2026学年上学期高三第一次联考生物试题


Mrs.Flippen's class sat listening to a talk being given by a local author.Tucker sat absent-mindedly in one of the library chairs.Most of the students wanted to hear about the writer's work.Tucker did not.
“Why bother?” Tucker thought to himself.He always received low marks on his writing assignments, no matter how hard he worked on them.He could never think of anything interesting to write about.
“Does anyone have any questions?” Mrs.Flippen asked her class.
Tucker raised his hand, “How do you know what to write about?”
“Well, sometimes I don't,” the author replied.“It takes a lot of hard work to come up with ideas.” She reached down and pulled a worn-looking book from a cloth bag on the floor.“I find making a scrapbook (剪贴簿) helps.”
Tucker sat up a little straighter in his seat.“What's in the book?” he asked.
“I fill it with pictures, stories, and notes about things that interest me.” The writer opened the scrapbook on her knee.“When I need an idea, I look through the book instead of staring at a blank page.”


1.think 2.simple 3.other 4.carefully 5.something 6.many 7.if 8.houses
9.teach 10.and
【导语】本文主要讨论了科学家对于动物能否被训练来为人类做简单工作的看法。
1.句意:一些科学家认为有一天动物可能会被教会做一些简单的工作。根据“Some scientists...that one day
animals may be taught to do a number of...jobs.”可知,此处表示科学家的观点或想法,且句子描述的是一般
性事实,时态为一般现在时,主语“Some scientists”为复数,谓语动词用原形,think“认为”符合语境。故填
think。


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6、拉萨市2025-2026学年上学期高三第一次联考生物试题


3、拉萨市2025-2026学年上学期高三第一次联考数学试题


6、拉萨市2025-2026学年上学期高三第一次联考政治试题


4、拉萨市2025-2026学年上学期高三第一次联考生物学试题


3、拉萨市2025-2026学年上学期高三第一次联考政治试题


实验操作及现象
实验结论
该溶液中一定含有
A
向某溶液中加入盐酸酸化的氯化钡溶液,有白色沉淀生成
S042
向某溶液中加入稀盐酸,产生的气体通入澄清石灰水中,


1.实验室制取乙炔时,________用排空气法收集乙炔:乙炔的相对分子质量为26,空气的平均相对分子质量为29,二者密度相差不大,难以收集到纯净的乙炔。
2.电石与水反应剧烈,为得到平稳的乙炔气流,可用________________溶液代替水,并用分液漏斗控制滴加饱和氯化钠溶液的________,让饱和氯化钠溶液________地滴入。
3.CaC2和水反应剧烈并产生________,为防止产生的________涌入导管,应在导管口塞入少许________ (图示装置中未画出)。
4.生成的乙炔有臭味的原因:由于电石中含有可以与水发生反应的杂质(如________、________等),使制得的乙炔中往往含有________、________等杂质,将混合气体通过盛有________溶液或________溶液的洗气瓶可将杂质除去
5.制取乙炔不能用启普发生器或具有启普发生器原理的实验装置,原因是
(1)碳化钙吸水性强,与水反应________,________随用、随停;
(2)反应过程中放出大量的热,易使启普发生器________;


3、拉萨市2025-2026学年上学期高三第一次联考化学答案