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试题答案

本文从以下几个角度介绍。

    2026届[文海大联考]g20高三起点考试历史试题

3、2026届[文海大联考]G20高三起点考试地理试题


2、2026届[文海大联考]G20高三起点考试生物试题


5.由短文和历史可知，杜牧和李白不属于同一时代，故选C。
十六、1. Chinese 2. cook 3. strict 4. funny
5. sing English songs
1.由信件第一段第三句可知，李老师是“我们”的语文老师,故填 Chinese。
2.由信件第一段第三句和第六句可知，李老师会做饭,故填 cook。
3.由信件第一段第七、八句可知，赵老师有时候严厉,故填 strict。
4.由信件第一段倒数第二、三句可知，张老师很有趣,故填 funny。


C. Archimedes and the Gold Crown. D. A King’s Worries about His Crown.
D
Why do we get frightened It is one of the ways our brains (脑) try to keep us safe.
Our body has a built-in survival instinct (生存本能) to protect us when we sense or see danger. Our heart starts to race and our breathing (呼吸) gets quicker. This helps us to deal with danger and it’s called “fight” (stay to face the danger) or “flight” (run away). And it all comes from our survival instinct.
Imagine you’re an early person, with lots of dangerous animals around. If a tiger appears, we need our body to act quickly. We’re either going to fight the tiger or to run away. To make us get ready, our brain tells our heart to speed up, making it beat harder and faster. Our breathing gets quicker to get more oxygen (氧气) in.
Feeling frightened is helpful. But sometimes our brain can’t tell the difference between real danger and something that just looks frightening. So we can get the same frightened feeling even if we’re not in real danger. For example, your heart may race when you give a speech. You may feel nervous when you take an exam. That’s because our brain sometimes mixes up “real danger” with “worries.” But that’s okay! It shows our body is working to protect us, even when we don’t need it to.
Feeling frightened isn’t bad. Next time you feel nervous remember: it’s your brain’s way of protecting you. And over time, maybe you’ll even be brave enough to deal with such feelings.


4、2026届[文海大联考]G20高三起点 数学试题


4、2026届[文海大联考]G20高三起点考试生物学试题


6、2026届[文海大联考]G20高三起点考试地理试题


5、2026届[文海大联考]G20高三起点考试地理试题


3、2026届[文海大联考]G20高三起点考试英语试题


4、2026届[文海大联考]G20高三起点考试生物试题


答案:(1)SiO2　(2)H2O2+2Fe2++2H+2Fe3++2H2O　(3)Mg(OH)2　(4)加热浓缩　过滤　(5)Ba2++2F-BaF2↓


C、根据通过上下移动螺母使水和电石接触或分开控制反应的发生和停止进行分析解答；
D、根据导管1需要定期清洁保养， 以防杂质堵塞进行分析解答。
19．（2025·云南）下列实验方案合理的是（　　）
选项 实验目的 实验方案
A 鉴别生理盐水、葡萄糖溶液 观察溶液颜色
B 鉴别C、 Fe、CuO粉末 取样，分别加入足量稀硫酸，观察现象
C 除去 溶液中的少量 加入足量 Fe粉，充分反应后过滤


3、2026届[文海大联考]G20高三起点考试化学答案