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2、云南省民族大学附属高级中学2026届高三联考卷(一)1数学试题


5、云南省民族大学附属高级中学2026届高三联考卷(一)1数学试题


In the past, many students practiced English with their pen friends—they sent letters to people all around the world. However, we now send e-mails to others and chat with people who live quite far away on the Internet.
Here’s some advice on how to succeed in your online language exchanges:
How to start a conversation when speaking English online
When you speak to somebody online, start by asking “Yes or No” questions. Use questions such as “Do you like …” or “Can you …” or “Have you ever …”
Remember your goal. You are trying to learn about the other persons. Think about things you enjoy and try to find some common ground between you. And share your own experiences to show that you have similar interests. If you only ask questions, you will sound like a policeman or a policewoman!
How to keep a conversation going
“Listen” carefully. In that way, you can get to know somebody well. When you know him or her well, you will have more to talk about. Then ask follow-up questions. After you “listen”, use what you “hear” to learn more about that person. Use “open ended” questions, such as “What do you think of …” or “What was the most interesting experience ...”


monkey.
After a while,the elephant met a rabbit.He asked him to be his friend.4
the rabbit said,"You are 5 big to play in my home!"
Then the elephant met a frog..“Will you be my friend ”he asked.“6_can
37岁暑假作业天天练人教版英语
三、1.C2.A3.C4.D5.D
33、34页


5、云南省民族大学附属高级中学2026届高三联考卷(一)1数学试题


6、云南省民族大学附属高级中学2026届高三联考卷(一)1数学试题


4、云南省民族大学附属高级中学2026届高三联考卷(一)1数学试题


6、云南省民族大学附属高级中学2026届高三联考卷(一)1数学试题


2、云南省民族大学附属高级中学2026届高三联考卷(一)1数学试题


5、云南省民族大学附属高级中学2026届高三联考卷(一)1数学试题


B. 所用稀盐酸的溶质质量分数为7.3%
C. 鸡蛋壳中碳酸钙的质量分数约为83.3%
D. 若加入稀盐酸的量不足，会导致测得鸡蛋壳中碳酸钙的含量偏小
【答案】B
【解析】
【详解】A、加入稀盐酸，发生的反应是，根据质量守恒定律，反应前后物质的总质量不变。反应前烧杯及杯内物质质量为160.0g，反应后质量为155.6g，则产生CO2的质量为，A 选项正确；
B、设100mL稀盐酸中溶质的质量为x，鸡蛋壳中碳酸钙的质量为y，则


（1）氢氧化钠溶液敞口放置空气中可能变质的原因是______(用化学方程式表示)。
（2）实验探究：
提出问题】该瓶溶液中含有哪些溶质？
【猜想与假设】猜想一：NaOH 猜想二：NaOH、Na2CO3 猜想三：Na2CO3
【查阅资料】Na2CO3溶液呈碱性，CaCl2溶液呈中性。
【实验一】A同学取适量该瓶溶液于试管中，加入过量稀盐酸，观察到有无色气泡产生，由此可知猜想________(选填“一”“二”或“三”)不成立。
【实验二】B、C两位同学在A同学结论的基础上分别重新取该瓶溶液进行实验。


3、云南省民族大学附属高级中学2026届高三联考卷(一)1数学答案