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本文从以下几个角度介绍。

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C. Boys and girls wear the same school uniforms in Singapore.
D. Students in Singapore don't need to wear school uniforms.
D
Thomas Edison is a famous inventor. But when he was young, many special things happened to him. One day, Thomas Edison came home and gave a letter to his mother. He told her, "My teacher gave the letter to me and told me only to give it to my mother."
His mother read the letter out loudly to her child, "Your son is a genius. This school is too-small-for him and doesn't have enough good teachers for teaching him. He needs a special and best teacher. Please teach him yourself."
Many, many years later, Edison's mother died and he was now a great and famous inventor. He was very clever and made many useful things. One day he looked for old family things in the old house. He missed his mother very much. Suddenly he saw a piece of paper in the desk. He took it and opened it up.
On the paper it said, " Your son is not as usual as other boys and girls. He is addled (头脑不正常的). We won't let him come to school anymore. He isn't our student from now on."


[亮点词汇]
①not only...but also...不仅……而且……
②international国际的
③helpful有帮助的
④custom习俗
[高分句型]
①I like it because it is not only a language but also a window to the world.（because引导的原因状语从句）


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1、[天一大联考]2025-2026学年高一阶段性测试(一)化学答案


通用版高考化学一轮复习
课时突破练21　元素周期律　元素推断与元素的性质
必备知识基础练
1.(2024·北京大兴区统考)下列有关元素性质的说法中错误的是(　　)
A.元素电负性:NaB.第一电离能:S>P>Si
C.最高化合价:Mn>Cr>V


D、要求出化学方程式中乙、丁的化学计量数，可设反应中的原子为：A（黄色）、B（蓝色）、C（黑色）；便于比较，从而确定出甲、乙、丙、丁的化学式，并推测出此反应的化学方程式为“2AB2+4CB=4CB2+A2”，从方程式不难看出乙、丁的分子个数比为4：1，故说法错误。
故选：D。
9．C
【详解】A、红磷燃烧消耗氧气，生成五氧化二磷，随着反应的进行，气体总质量减小，但是空气中氮气不参与反应，最终气体总质量不为0，故选项图像与实验对应不正确，
B、固体红磷燃烧消耗氧气，生成五氧化二磷固体，质量增加，完全反应后，固体质量不再发生变化，故选项图像与实验对应不正确；
C、红磷燃烧消耗氧气，生成五氧化二磷，随着反应的进行，氧气的质量减小，最后保持不变，故选项图像与实验对应正确，
D、红磷燃烧消耗氧气，生成五氧化二磷，随着反应的进行，氧气的体积分数减小，最后保持不变，故选项图像与实验对应不正确。


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