2025九年级期末试卷

2025-2025学年九年级上学期期末模拟考试试卷

（考试时间：120分钟 满分：600分）

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语 文

（满分：120分，考试时间：120分钟）

积累与运用（共25分）

1. 下列加点字注音完全正确的一项是（ ）（3分） A. 拮据 (jū) 旁骛 (wù) 亵渎 (xiè) 强聒不舍 (qiǎng) B. 妖娆 (ráo) 田圃 (pǔ) 喑哑 (yīn) 润如油膏 (gāo) C. 旁鹜 (wù) 承蜩 (tiáo) 睿智 (ruì) 廓然无累 (kuò) D. 栖息 (qī) 襁褓 (qiǎng) 陨落 (yǔn) 涕泗横流 (sì)

2. 下列词语书写无误的一项是（ ）（3分） A. 恪尽职守 脍灸人口 涕泗横流 怒不可遏 B. 重蹈覆辙 气吞斗牛 一代天骄 断章取意 C. 润如油膏 不言而喻 强聒不舍 黎民百姓 D. 媚上欺下 孜孜不倦 神色张皇 无与沦比

3. 下列句子中加点成语使用正确的一项是（ ）（3分） A. 这篇文章观点十分新颖，但在论证上存在一些逻辑问题，可谓瑕不掩瑜。 B. 我们来到美丽的西湖，看到湖光山色，真是美不胜收。 C. 他平时沉默寡言，在这次演讲比赛中却取得了第一名，真是石破天惊。 D. 为了备战中考，同学们每天晚上都在教室里不耻下问，互相讨论问题。

   
   （图片来源网络，侵删）

4. 古诗文默写。（共10分，每空1分） （1）过尽千帆皆不是，____。（温庭筠《望江南》） （2）____，燕然未勒归无计。（范仲淹《渔家傲·秋思》） （3）____，背灼炎天光。（白居易《观刈麦》） （4）足蒸暑土气，____。（白居易《观刈麦》） （5）今夜偏知暑气暖，____。（刘方平《月夜》） （6）____，人迹板桥霜。（温庭筠《商山早行》） （7）辛弃疾在《破阵子·为陈同甫赋壮词以寄之》中，抒发渴望为国建功立业，却壮志难酬的悲愤的句子是：____，____。 （8）诸葛亮在《出师表》中向后主提出的三条建议是：亲贤臣，远小人；____，____。

5. 名著阅读。（6分） 《水浒传》中的英雄好汉各有绰号，有些绰号鲜明地概括了人物的特点，请从下面人物中任选一个，结合具体情节，简述其绰号的由来。 （1）及时雨 宋江 （2）豹子头 林冲 （3）智多星 吴用

   我选：___ 简述：___

阅读理解（共45分）

（一）阅读下面的文言文，完成6-9题。（共13分）

出师表（节选）

诸葛亮

先帝创业未半,而中道崩殂，今天下三分，益州疲弊，此诚危急存亡之秋也，然侍卫之臣不懈于内，忠志之士忘身于外者，盖追先帝之殊遇，欲报之于陛下也，诚宜开张圣听，以光先帝遗德，恢弘志士之气，不宜妄自菲薄，引喻失义，以塞忠谏之路也。

宫中府中,俱为一体，陟罚臧否，不宜异同，若有作奸犯科及为忠善者，宜付有司论其刑赏，以昭陛下平明之理，不宜偏私，使内外异法也。

6. 解释下列加点词语在句中的意思。（4分） （1）崩殂：____ （2）危急存亡之秋：____ （3）开张圣听：____ （4）陟罚臧否：____

7. 将下列句子翻译成现代汉语。（4分） （1）然侍卫之臣不懈于内，忠志之士忘身于外者，盖追先帝之殊遇，欲报之于陛下也。 ___ （2）若有作奸犯科及为忠善者，宜付有司论其刑赏。 ___

8. 诸葛亮在文中向刘禅提出了哪两条建议？请用自己的话概括。（2分） ___

9. 结合选文内容，说说诸葛亮是一个怎样的人？（3分） ___

（二）阅读下面的说明文，完成10-13题。（共14分）

PM2.5——我们呼吸的“隐形杀手”

①近年来，“PM2.5”这个词频繁出现在我们的生活中，它究竟是什么，又为何如此受到关注呢？

②PM2.5是指大气中直径小于或等于2.5微米的颗粒物，也称为可入肺颗粒物，它的直径还不到人的头发丝粗细的1/20，虽然微小，但它对人体的危害却不容小觑。

③PM2.5之所以危害巨大，首先在于它能直接进入人体的肺泡，并沉积下来，进入血液循环，对人体的呼吸系统和心血管系统造成严重损害，研究表明，PM2.5浓度每上升10微克/立方米，居民总死亡率上升约4%，呼吸系统疾病死亡率上升约6%，PM2.5的来源复杂，既包括自然来源，如风扬尘土、火山喷发等，也包括人为来源，如工业排放、汽车尾气、建筑扬尘、秸秆焚烧等，人为源是造成城市PM2.5浓度升高的主要原因。

④面对PM2.5的威胁，我们并非束手无策，对于个人而言，在雾霾天气里，应尽量减少外出，尤其是老人、儿童和患有心肺疾病的人群，如果必须外出，应佩戴专业的防颗粒物口罩，应关闭门窗，使用空气净化器可以有效降低室内PM2.5浓度，对于社会而言，治理PM2.5污染是一项系统工程，需要政府、企业和公众的共同努力，政府应加大环保投入，严格限制工业和机动车污染排放；企业应积极进行技术改造，推行清洁生产；公众则应选择绿色出行，积极参与植树造林等环保活动。

⑤PM2.5监测和信息公开，是科学治理大气污染的前提，我国已将PM2.5纳入常规空气质量监测体系，并向公众实时发布数据，这让我们能更清晰地了解我们所处的空气质量状况，从而采取相应的防护措施。

⑥PM2.5是威胁我们健康的“隐形杀手”，保护我们赖以生存的空气环境，需要我们每个人的关注和行动。

10. 请用简洁的语言概括本文的说明内容。（3分） ___

11. 第③段主要运用了哪些说明方法？有什么作用？（5分） 说明方法：____ 作用：___

12. PM2.5对人体有哪些危害？请简要概括。（3分） ___

13. 阅读第④段，说说我们个人在雾霾天气里可以采取哪些防护措施。（3分） ___

（三）阅读下面的记叙文，完成14-18题。（共18分）

那一次，我流泪了

①从小到大，我很少流泪，即使遇到再大的困难，我也会告诉自己：要坚强，不能哭，但那一次，我却哭了，哭得那么伤心。

②那是我上初二时的事，我的数学成绩一直不好，每次考试都在及格线边缘徘徊，为了迎接即将到来的期末考试，我每天晚上都学到很晚，做了大量的习题，可成绩却始终不见起色，我开始变得焦虑、烦躁，甚至开始怀疑自己的能力。

③期末考试那天，我怀着忐忑的心情走进考场，拿到试卷，我一看，头就大了，很多题目都是模棱两可，感觉会做，却又下不了笔，考试结束的铃声响起，我还有一大片空白，我走出考场，感觉天都要塌下来了。

④几天后，成绩公布了，我果然考砸了，数学只考了58分，当老师念到我的分数时，我的脸“刷”地一下红了，恨不得找个地缝钻进去，同学们投来的目光，有同情，也有嘲笑，像针一样扎在我心上。

⑤放学后，我低着头，独自一人走在回家的路上，夕阳把我的影子拉得很长，我的心也像这影子一样，沉甸甸的，我不敢回家，不敢面对父母失望的眼神，我坐在路边的一个长椅上，眼泪终于不争气地掉了下来。

⑥就在这时，一只温暖的手搭在了我的肩膀上，我回头一看，是班主任李老师，她没有说话，只是静静地坐在我身边，陪我一起看着远方的落日。

⑦良久，她才缓缓开口：“一次失败不算什么，重要的是你有没有从失败中站起来，我知道你很努力，努力的过程比结果更重要，你只是暂时没有找到正确的方法，我们一起找，好吗？”

⑧老师的话像一股暖流，瞬间温暖了我冰冷的心，我抬起头，看到老师眼中没有责备，只有鼓励和信任，那一刻，我所有的委屈、沮丧和压力，都化作了汹涌的泪水，决堤而出，我用力地点了点头，哭得更大声了。

⑨那一次的泪水，不是因为悲伤，而是因为感动，因为感受到了前所未有的温暖和力量，它让我明白，失败并不可怕，只要有人愿意拉你一把，只要你还有重新站起来的勇气。

14. 是“那一次，我流泪了”，请简要概括“我”流泪的原因。（3分） ___

15. 第②段和第③段中，作者描写了“我”考试前后的心理变化，请用词语概括这种变化。（2分） 焦虑、烦躁 → ___

16. 第⑤段中画线的句子运用了什么描写方法？有什么表达效果？（4分） 描写方法：____ 效果：___

17. 李老师对“我”说了哪些话？这些话对“我”产生了怎样的影响？（5分） 说的话：___ 影响：___

18. 结合全文，谈谈你对“那一次的泪水，不是因为悲伤，而是因为感动”这句话的理解。（4分） ___

作文（共50分）

19. 题目：那一次，我___

**要求：**
（1）将题目补充完整，那一次，我长大了；那一次，我懂得了感恩；那一次，我战胜了自己等。
（2）写一篇不少于600字的记叙文。
（3）文中不得出现真实的人名、校名、地名。
（4）书写工整，卷面整洁。

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数 学

（满分：120分，考试时间：100分钟）

选择题（本大题共10小题，每小题3分，共30分，在每小题给出的四个选项中，只有一项是符合题目要求的）

1. -2的相反数是（ ） A. 2 B. -2 C. 1/2 D. -1/2

2. 下列计算正确的是（ ） A. a² · a³ = a⁶ B. (a²)³ = a⁵ C. a⁶ ÷ a² = a³ D. (ab)² = a²b²

3. 一元二次方程x² - 2x = 0的解是（ ） A. x = 0 B. x = 2 C. x₁ = 0, x₂ = 2 D. x₁ = 0, x₂ = -2

4. 下列图形中,既是轴对称图形，又是中心对称图形的是（ ） A. 等腰三角形 B. 平行四边形 C. 矩形 D. 等腰梯形

5. 反比例函数y = k/x (k≠0)的图像经过点（2, -3），则k的值为（ ） A. -6 B. -3 C. 3 D. 6

6. 如图,在⊙O中，∠AOB = 100°，则∠ACB的度数为（ ） （注：此处应有图，圆心角∠AOB所对的弧为劣弧，点C在圆周上，与A、B不在同侧） A. 50° B. 80° C. 100° D. 130°

7. 某校九年级（1）班共有50名学生，其中女生25名，现用抽签法选取10名学生参加座谈会，恰好选中3名女生的概率是（ ） A. 1/5 B. 3/10 C. 1/2 D. 3/50

8. 一个圆锥的底面半径为3,高为4，则这个圆锥的侧面积为（ ） A. 12π B. 15π C. 20π D. 24π

9. 二次函数y = x² - 2x + 3的顶点坐标是（ ） A. (1, 2) B. (1, 4) C. (-1, 2) D. (-1, 4)

10. 如图,在△ABC中，DE∥BC，AD = 2，DB = 3，则△ADE与△ABC的面积之比为（ ） （注：此处应有图，DE平行于BC，交AB于D，AC于E） A. 2:3 B. 4:9 C. 2:5 D. 4:25

填空题（本大题共6小题，每小题3分，共18分）

11. 因式分解：x² - 4 = ____。

12. 函数y = √(x-2)中，自变量x的取值范围是__。

13. 不等式组 2x > 1, x-1 ≤ 2 的解集是__。

14. 如图,PA、PB是⊙O的切线，A、B是切点，∠APB = 60°，⊙O的半径为3，则OP的长为__。 （注：此处应有图，P在圆外，PA、PB为切线，连接OA、OB、AB）

15. 如图,在矩形ABCD中，AB = 4，BC = 6，E是BC的中点，连接AE，则tan∠AEB的值为__。 （注：此处应有图，矩形ABCD，E为BC中点，连接AE）

16. 观察下列等式： 1³ = 1² 1³ + 2³ = 3² 1³ + 2³ + 3³ = 6² 1³ + 2³ + 3³ + 4³ = 10² ... 根据你发现的规律，计算 1³ + 2³ + 3³ + ... + 10³ = ____。

解答题（本大题共8小题，共72分，解答应写出文字说明、证明过程或演算步骤）

17. （本题满分8分）计算：(-1/2)⁻¹ + |√3 - 2| - (√2)⁰ + (π-3.14)⁰

18. （本题满分8分）先化简，再求值：(x+2)² / (x²-4) - x/(x-2)，其中x = √2 + 1。

19. （本题满分8分）解一元二次方程：x² - 4x + 1 = 0。

20. （本题满分8分）如图，在△ABC中，AB = AC，D是BC边的中点，连接AD。 （1）求证：△ABD ≌ △ACD。 （2）若∠B = 30°，AB = 4，求AD的长。 （注：此处应有图，等腰三角形ABC，D为BC中点，连接AD）

21. （本题满分9分）某商店将进价为40元的商品按50元售出，能卖出500件，已知售价每上涨1元，销量就减少10件，为了获得最大利润，售价应定为多少元？此时最大利润是多少元？

22. （本题满分9分）如图，在平面直角坐标系中，△ABC的三个顶点坐标分别为A(-2, 3), B(-4, 1), C(-1, -1)。 （1）将△ABC向右平移5个单位长度，得到△A₁B₁C₁，请画出△A₁B₁C₁。 （2）将△A₁B₁C₁绕点C₁顺时针旋转90°，得到△A₂B₂C₂，请画出△A₂B₂C₂。 （3）求点A旋转到点A₂所经过的路径长。 （注：此处应有坐标系和△ABC）

23. （本题满分10分）如图，AB是⊙O的直径，点C是⊙O上一点，CD⊥AB，垂足为D，弦CE交AB于点F，连接AC、BC。 （1）求证：∠ACD = ∠BCE。 （2）若AB = 10，CD = 4，求AF·BF的值。 （注：此处应有图，直径AB，C在圆上，CD垂直AB于D，CE交AB于F）

24. （本题满分10分）如图，在平面直角坐标系中，抛物线y = ax² + bx + c (a≠0)经过点A(-1, 0), B(3, 0), C(0, 3)。 （1）求抛物线的解析式。 （2）点P是抛物线上的一个动点，当△PAB的面积为6时，求点P的坐标。 （3）若点M是抛物线对称轴上的一个动点，当△ABM的周长最小时，求点M的坐标。 （注：此处应有坐标系和抛物线）

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英 语

（满分：120分，考试时间：90分钟）

听力理解（共20分，略） (注：听力部分需要音频，此处省略，请自行模拟)

单项选择（共15小题，每小题1分，共15分）

21. — ___ do you go to the movies? — Once a month. A. How long B. How often C. How soon D. How far

22. — Look! What's ___ over there? — Oh, it's a kite. A. this B. that C. it D. one

23. My mother asked me ___ too much time on computer games. A. not to spend B. not spend C. don't spend D. to not spend

24. — I'm sorry I broke your cup. — ___. A. That's right B. You're welcome C. It doesn't matter D. Don't say so

25. This is the book ___ I bought yesterday. A. who B. which C. what D. whom

26. — I feel tired these days. — You'd better ___ a rest. A. to have B. have C. having D. had

27. — Will you please come to my birthday party? — ___. A. I'd love to B. Yes, I will C. No, I won't D. I don't know

28. The weather in Beijing is colder than ___ in Guangzhou. A. it B. that C. this D. one

29. — Must I finish my homework now? — No, you ___. You can do it tomorrow. A. mustn't B. needn't C. shouldn't D. can't

30. The teacher speaks very loudly ___ all the students can hear her. A. so that B. because C. if D. although

31. ___ interesting story it is! A. What B. What an C. How D. How an

32. I ___ my keys in the classroom this morning. I had to go back to get them. A. forgot B. left C. lost D. found

33. English is widely used ___ a second language in many countries. A. for B. as C. by D. with

34. — Could you tell me ___? — Sorry, I don't know. A. where is the post office B. where the post office is C. where was the post office D. where the post office was

35. — I'm going to Hainan for vacation next week. — ___. A. Have a good time B. You're welcome C. Thank you D. Not at all

完形填空（共10小题，每小题1分，共10分）

阅读下面短文,掌握其大意，然后从各题所给的A、B、C、D四个选项中选出最佳选项。

Last Sunday, I went to the park with my best friend, Lily. It was a beautiful day. The sun was 36 and the birds were singing in the trees. We decided to have a picnic by the lake.

We spread a big 37 on the grass and put all the food on it. We had sandwiches, fruit, and some drinks. We were just about to 38 the food when we saw a little dog 39 near us. It looked very hungry. Its fur was dirty and its eyes were sad.

Lily is a very kind girl. She 40 the dog and said, "Poor little thing! Are you lost?" The dog wagged its tail and came closer. Lily took out a piece of meat and gave it to the dog. The dog ate it 41 .

After that, the dog followed us 42 . We walked around the lake for about half an hour. Suddenly, the dog started to bark and ran to a man who was calling its name. We knew the dog 43 its owner. The man was very 44 to see his dog back. He thanked Lily and me many times.

We felt very happy because we helped someone find his 45 friend. It was a meaningful day.

36. A. shining B. raining C. snowing D. blowing

37. A. bag B. box C. cloth D. table

38. A. cook B. eat C. buy D. pack

39. A. sitting B. running C. swimming D. jumping

40. A. shouted at B. laughed at C. looked at D. pointed at

41. A. slowly B. quickly C. quietly D. loudly

42. A. carefully B. happily C. sadly D. angrily

43. A. found B. lost C. knew D. liked

44. A. sad B. angry C. surprised D. excited

45. A. old B. new C. lost D. lovely

阅读理解（共20小题，每小题2分，共40分）

阅读下列短文,从每题所给的A、B、C、D四个选项中选出最佳选项。

A

Mr. Brown is a teacher in a small town. He has a car, but he doesn't use it to go to school. He usually walks to school every day. His school is not far from his home, only about one kilometer away.

"I like walking," says Mr. Brown. "It's good for my health. I can also enjoy the fresh air and the beautiful scenery on the way."

One day, it was raining heavily in the morning. Mr. Brown thought he would drive his car to school. But when he got to his car, he found a cat sleeping on it. The cat was wet and cold. Mr. Brown didn't want to wake it up. So he decided to walk to school again in the rain.

When he got to school, he was all wet. His students saw him and asked, "Mr. Brown, why are you so wet? Why didn't you drive your car?" Mr. Brown smiled and told them about the cat. All the students were moved by his kindness.

46. Where does Mr. Brown work? A. In a big city. B. In a small town. C. In a village. D. In a factory.

47. How does Mr. Brown usually go to school? A. By bus. B. By car. C. On foot. D. By bike.

48. Why does Mr. Brown like walking? A. Because he doesn't have a car. B. Because it's good for his health. C. Because the weather is fine. D. Because he has no time to drive.

49. What happened to Mr. Brown one rainy day? A. His car was broken. B. A cat was sleeping on his car. C. He was ill. D. He missed the school bus.

50. How did Mr. Brown's students feel when they heard the story? A. They felt bored. B. They felt angry. C. They felt moved. D. They felt surprised.

B

Do you want to be a top student? Here are some good habits for you.

Plan your time. There are 24 hours in a day, but you can't use all of them for studying. You need to sleep, eat, and have a rest. Make a plan for your day. You should know what to do and when to do it.

Find a good place to study. This place should be quiet and clean. A desk with good light is a good choice. When you study, put away things like phones and computers that may distract you.

Study regularly. Don't wait until the night before a test to study. You should review your lessons every day. This will help you remember what you have learned for a long time.

Develop reading skills. Reading is very important for learning. Try to read different kinds of books, such as storybooks, newspapers, and magazines. When you read, try to understand the main idea.

Be confident. If you have a problem, don't be afraid to ask your teachers or classmates for help. Believe in yourself. You can do it if you try your best.

51. How many hours are there in a day? A. 12. B. 24. C. 36. D. 48.

52. What should you do when you study? A. Watch TV. B. Play computer games. C. Put away your phone. D. Listen to music loudly.

53. When should you review your lessons? A. Only before a test. B. Every day. C. Only on weekends. D. When you are free.

54. What kind of books are good for reading according to the passage? A. Only storybooks. B. Only newspapers. C. Only magazines. D. Storybooks, newspapers, and magazines.

55. What is the most important thing if you have a problem? A. To ask for help. B. To give up. C. To be quiet. D. To be angry.

C

Tea is one of the most popular drinks in the world. But do you know where it came from? The story of tea began in ancient China.

According to an old story, one day, a ruler named Shennong was boiling water outside his house. Some leaves from a wild tree fell into the pot. The water turned brown and had a pleasant smell. Shennong was a curious man, so he decided to taste it. He found it tasted good and refreshing. This was the first cup of tea.

Tea became very popular in China. During the Tang Dynasty (618-907), a man named Lu Yu wrote a book called "The Classic of Tea". It was the first book about tea in the world. From then on, tea culture developed quickly.

Tea was not brought to other countries until thousands of years later. It was first introduced to Japan by Buddhist monks. Then, European traders brought it to Europe in the 16th century. Now, people all over the world enjoy drinking tea.

56. Where did tea first come from? A. Japan. B. Europe. C. India. D. Ancient China.

57. Who was Shennong? A. A tea farmer. B. A ruler. C. A writer. D. A monk.

58. When did Lu Yu write "The Classic of Tea"? A. In the Song Dynasty. B. In the Tang Dynasty. C. In the Ming Dynasty. D. In the Qing Dynasty.

59. Who brought tea to Europe? A. Buddhist monks. B. European traders. C. Japanese people. D. Chinese rulers.

60. Which of the following is TRUE according to the passage? A. Shennong didn't like the taste of tea at first. B. "The Classic of Tea" was the first book about tea in the world. C. Tea was brought to Japan at the same time as to Europe. D. People in the world started drinking tea at the same time.

D

Do you often feel tired? Do you have trouble sleeping at night? If so, you may need to change your lifestyle. Here are some tips to help you feel better.

Get enough sleep. Most teenagers need about 8 to 10 hours of sleep each night. If you don't get enough sleep, you will feel tired and have trouble concentrating in class. Try to go to bed and get up at the same time every day, even on weekends.

Eat healthy food. Eating too much junk food like candy, chips, and soda is bad for your health. You should eat more fruits, vegetables, and whole grains. A healthy diet gives you energy to study and play.

Exercise regularly. Exercise is good for both your body and mind. It can help you relax and sleep better. You don't have to do sports like running or playing basketball. Even a 30-minute walk every day can be helpful.

Manage stress. Schoolwork and exams can cause a lot of stress. When you feel stressed, try to do something you enjoy, like listening to music, reading a book, or talking to a friend. Don't keep your worries to yourself.

61. How much sleep do most teenagers need every night? A. 6 to 8 hours. B. 8 to 10 hours. C. 10 to 12 hours. D. 12 hours or more.

62. What should you eat more to stay healthy? A. Candy and chips. B. Soda and hamburgers. C. Fruits and vegetables. D. Ice cream and cakes.

63. What can exercise help you do? A. Eat more. B. Sleep better. C. Study less. D. Feel more stressed.

64. When you feel stressed, what should you NOT do? A. Listen to music. B. Talk to a friend. C. Keep worries to yourself. D. Read a book.

65. What is the main idea of the passage? A. How to get good grades. B. How to make friends. C. How to have a healthy lifestyle. D. How to manage your pocket money.

词汇运用（共10小题，每小题1分，共10分）

根据句意及首字母或汉语提示,写出单词的正确形式。

66. Please keep q_____ in the library. Don't talk loudly.
67. I'm t_____. I'd like something to drink.
68. My father is a doctor. He works in a h_____.
69. It's important for us to p_____ the environment.
70. The Great Wall is one of the famous w_____ in the world.
71. There are many _____ (商店) on the street.
72. He is very _____ (友好的) and everyone likes him.
73. My mother usually _____ (做饭) for us in the evening.
74. Look! The children are playing _____ (快乐地) on the playground.
75. This book is very _____ (有用的). You should read it.

书面表达（共15分）

假设你是李华,你的英国笔友Tom给你发来邮件，说他对中国的春节很感兴趣，想了解一些情况，请你给他回一封邮件，介绍春节。

要求：

1. 介绍春节的时间（农历正月初一）。
2. 描述一两个春节的传统习俗（如贴春联、吃饺子、放鞭炮、给红包等）。
3. 表达你对春节的感受。
4. 邮件格式正确,语言通顺，词数80词左右。

Dear Tom,

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Best wishes, Li Hua

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物 理

（满分：100分，考试时间：90分钟）

选择题（共12小题，每小题3分，共36分，在每小题给出的四个选项中，只有一个选项是符合题目要求的）

1. 下列数据中最接近实际情况的是（ ） A. 一本物理课本的质量约为5kg B. 光在真空中的传播速度约为3×10⁸ m/s C. 人体的正常体温约为42℃ D. 对人体安全的电压为36V

2. 下列关于声现象的说法中正确的是（ ） A. 声音可以在真空中传播 B. 只要物体振动，我们就一定能听到声音 C. 用不同乐器演奏