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试题答案

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3、大通县2025年高三第二次模拟(25-L-638C)政治试题


4、大通县2025年高三第二次模拟(25-L-638C)生物试题


“Go where, Grandma ” I asked. “Where” turned out to be Kerby’s General Store, the one store in town that had a little bit of just about everything. As we walked through its doors, Grandma handed me ten dollars. “Take this money,” she said, “and buy something for someone who needs it. I’ll wait for you in the car.” Then she turned and walked out of Kerby’s.
I was only eight years old. I’d often gone shopping with my mother, but never had I shopped for anything all by myself. The store seemed big and crowded, full of people competing to finish their Christmas shopping. For a few moments I just stood there, confused, holding that ten-dollar bill, wondering what to buy and who to buy it for. I suddenly thought of Bobby Decker, who was a kid with bad breath and messy hair. He sat right behind me in Mrs Pollock’s grade-two class.
Bobby Decker didn’t have a coat. I knew that because he never went out for recess during the winter. His mother always wrote a note, telling the teacher that he had a cough, but we kids knew that Bobby Decker didn’t have a cough, and he didn’t have a coat. I would buy Bobby Decker a coat! I settled on a red one, which looked really warm, and he would like that.
“Is this a Christmas present for someone ” the lady behind the counter asked kindly, as I laid my ten dollars down. “Yes.”
The nice lady smiled at me, put the coat in a bag and wished me a Merry Christmas.
注意:
1.续写词数应为150左右；


英语试卷第1页共8页


4、大通县2025年高三第二次模拟(25-L-638C)政治试题


1、大通县2025年高三第二次模拟(25-L-638C)英语试题


4、大通县2025年高三第二次模拟(25-L-638C)数学试题


2、大通县2025年高三第二次模拟(25-L-638C)数学试题


3、大通县2025年高三第二次模拟(25-L-638C)语文试题


4、大通县2025年高三第二次模拟(25-L-638C)政治试题


B、根据化学反应前后元素种类不变分析；
C、根据热胀冷缩原理检查装置气密性方法分析；
D、根据红磷燃烧放热分析。
20．（2024九上·绥江期中）甲、乙、丙为初中化学一至四单元中常见的物质，甲、乙组成元素相同，且都为氧化物，丙为单质，它们的转化关系如图所示(“→”表示反应一步实现，部分物质和反应条件略去)，下列说法错误的是
A．甲的化学式为H2O2
B．丙具有可燃性，可用作燃料
C．反应①②的基本反应类型相同，都为分解反应


【解析】【解答】（1）磷元素的化学符号是：P。
故答案为：P；
（2）红磷是磷单质，由原子构成，由原子构成的物质，直接用元素符号表示其化学符号，所以红磷为P。
故答案为：P
（3）书写化学式时，通常遵循“顺写反读”的规则，氧化物氧元素放在右边，其他元素放在左边，五氧化二磷的化学符号是：P2O5。
故答案为：P2O5。
【分析】根据元素符号、单质化学式以及氧化物化学式的书写进行分析解答。


3、大通县2025年高三第二次模拟(25-L-638C)化学答案