Unit 2 What time is it？Part B （课件+素材）-2025-2026学年接力版英语四年级下册

为什么北京中午12点，而纽约却是半夜11点？为什么同一个地球上不同的地方有不同的时间呢？今天我们就来了解一下时区的概念，先来了解一下时区的由来。地球是一个球体，它围绕着太阳公转，同时也自转。因为自转的原因，地球上不同的地方会在不同的时间看到太阳。当太阳正好照射到某个地方的正上方时，那个地方就是正午。这种根据太阳和本地子午线经过本地、正北和正南的经验所确定的时间叫做地方时。如果每个地方都用自己的地方时，那么就会很混乱，这种时间上的混乱也不利于全球的交流和合作。为了解决这个问题，1884年在美国华盛顿召开了子午线国际会议，决定把地球表面360度划分为24个时区，每个时区横跨经度15度，相邻两个时区的时间相差一小时。这样，同一个时区内的所有地方就可以使用同一个时间，叫做区时而不同时，区之间的时间差就可以用简单的加减法来计算。时区是怎么划分的呢？在划分时区的时候，有一个重要的参考点，就是本初子午线线。本初子午线是一条经过英国伦敦郊区格林尼治天文台的经线，也叫做零度经线。本初子午线所在的时区叫做中时区或零时区中时区或零时区的时间叫做格林遗址，平时也叫做世界协调时间，简称UTC。它是全球最基本和最重要的时间。标准时区以本初子午线为基准，向东划分为东一区到东十二区区，向西划分为西一区到西十二区。比如北京所在的东八区就可以表示为UTC加8，纽约所在的西五区就可以表示为UTC减50区又分为理论时区和实际时区。理论时区以被15整除的经线为中心，向东西两侧延伸7.5度，即每15度划分一个时区，这是理论时区。理论时区的时间采用其中央经线或标准经险的地方是，所以每差一个时区，虚实相差1个小时，相差多少个时区就相差多少个小时。因此推算东十二区和西十二区为同一地方。为避免同一地方日期却相差一天的矛盾，提出国际换日线的概念。国际换日线东侧比西侧池整整24小时。在划分时区的过程中，还要考虑到一些实际情况。比如有些国家或地区可能跨越了多个市区，为了方便管理和统一使用，就会选择其中一个时区作为全国或全地区的标准时间。就拿中国来说，从最西边的新疆在东五区，最东边的黑龙江则在东九区，全国横跨了五个市区。中国就采用东八区，以北京时间作为全国统一使用时间，这就是市级市区及法定时区。还有些国家或地区可能会根据季节或历史原因而调整时区，比如有些国家会在夏季实行下令时把时间提前一小时，以充分利用光照资源，节约能源。比如英国在夏季会把时间从UTC调整为UTC加1。还有些国家可能会为了纪念某些事件或者突出自己的独立性而改变时区。比如朝鲜在2015年把时间从UTC加九调整为UTC加8.5，成为平壤时间。尼泊尔使用UTC加5.75。怎么样？你学会了吗？视频最后再讲几个关于时区的趋势。中国曾经划分过五个市区，中原市区、龙属市区、心脏市区、昆仑市区和长白市区。1949年新中国成立后，就采用东八区的北京时间作为全国统一使用时间。俄罗斯是世界上跨越时区最多的国家，共有11个时区。西班牙本应属于西陵区或西翼区，但是由于二战期间要与德国保持一致而采用了东一区的时间，这导致西班牙人的作息和太阳节律不同步，晚饭时间通常在晚上九点或十点。你还知道关于时区的哪些。 null地球上为什么会有春夏秋冬四季？为什么会存在地区温度差异呢？简单来说就是地轴的倾斜导致季节的产生。一年当中有一部分地球会接收到太阳最直接的光线，当北极向太阳倾斜时，就是北半球的夏天。当南极向太阳倾斜时，就是北半球的冬天。当地球在围绕太阳公转运行时，地轴始终向一个方向倾斜。正是因为这个倾角的存在，才会使太阳在地球表面的直射点在南北回归线之间移动，从而形成了春夏秋冬四个季节。六月北极向太阳倾斜，12月是南极向太阳倾斜。六月之所以是夏天，是因为太阳光线照射到地球的角度要比一年中的任何其他时间都更大，获得的阳光能量密度更大，热量更加集中。而12月正好相反，世界各地的春夏秋冬到来的时候会不一样，长短也有所不同。那么一年中的四个季节，你最喜欢哪个季节呢？好了，我是新晋行长，下期想了解什么？ nullnullnullnullUnit . two, time. time. half . half. past, past, late. late. get. get, when . when . o'clock. o'clock. breakfast. breakfast, home . home. Half . half. nullnullnull（接力版）四年级 下 Part B Unit 2 What time is it? 01 Learning Objectives 02 Lead in 03 Presentation 04 Practice 05 Production 06 Summary 07 Homework Learning Objectives 01 1. 能够听、说、认读：half,past,get,when, o’clock,breakfast, home 2. 能够在情景中理解、会说: When do you get up? I get up at half past seven. I have breakfast at half past seven. It’s time to get up. 3.能够培养时间观念；学会合理安排时间；树立跨文化理解概念。 Lead in 02 Guess: I have no mouth,but I can tell you the time. I have no legs,but I can run fast. What am I? I’m a clock/watch. Lead in 02 What time is it? It’s three o’clock. Let’s review What time is it? It’s half past four. Lead in 02 What time do you go to school? I go to school at half past seven. Let’s review Is it late for class? Yes,it is. Lead in 02 When do you get up? Big question Presentation 03 Look,listen and say o’clock What time is it? It’s three o’clock. ......点钟 Presentation 03 Look,listen and say past What time is it? It’s half past nine. 晚于；在......之后 Presentation 03 Look,listen and say half What time is it? It’s half past five. 一半 Presentation 03 Look,listen and say when When do you go to bed? I go to bed at half past nine. 什么时候 Presentation 03 Look,listen and say get When do you get up? I get up at seven o’clock. 到达；得到 Presentation 03 Look,listen and say breakfast When do you have breakfast? I have breakfast at seven twenty. 早餐 Presentation 03 Look,listen and say home When do you go home? I go home at half past eleven. 家 o’clock ......点钟 half 一半 when 什么时候 past 晚于， 在...之后 get 到达， 得到 breakfast 早餐 home 家 Presentation 03 Look,listen and say. Presentation 03 Look,listen and say. Presentation 03 Look,listen and say. Presentation 03 Listen again and judge 1.Lingling goes to school at half past seven. Yes. No. 2. Li Ming goes to school at nine. Yes. No. 3.Taotao goes to bed at nine. Yes. No. √ √ √ Presentation 03 Look,listen and say. I’m from Jinan. I get up at seven. I have breakfast at half past seven. I go to school at eight. I’m from Urumqi. I get up at half past eight. I have breakfast at nine. I go to school at half past nine. Presentation 03 Listen again and answer. I’m from Jinan. I get up at seven. I have breakfast at half past seven. I go to school at eight. I’m from Urumqi. I get up at half past eight. I have breakfast at nine. I go to school at half past nine. Why do they do the same things at different time? Because of the Earth’s rotation,people in diffferent places see the sun at different time. Presentation 03 Listen and sing. It’s time to get up! It’s time to get up!Wake up! Tick,tock,tick,tock!Tick,tock,tick,tock! What’s the time?What’s the time? It’s time to get up.It’s time to get up. It’s seven o’clock.It’s seven o’clock. Let’s learn 询问时间 除了用What time is it? 还可以用What’s the time? 如何表达“到了做某事的时间了” 除了用It’s time to +动词原型/动词短语. 还可以用It’s time for+名词. eg:It’s time to go to school. =It’s time for school. Practice 04 Look and match. At nine. At half past seven. At eight. Practice 04 Group work Names go home play football get up go to school When do you go home? I go home at 11:30. When do you play football? At 3:30. Peter 11:30 3:30 Practice 04 Group work When do you get up? I get up at 7:00. When do you go to school? At 7:50. Names go home play football get up go to school Peter 11:30 3:30 7:00 7:50 Practice 04 Group work When do you go home? I go home at 11:40. When do you play football? At 5:00. Names go home play football get up go to school Peter 11:30 3:30 7:00 7:50 Jerry 11:40 5:00 Practice 04 Group work When do you get up? I get up at 7:10. When do you go to school? At 8:00. Names go home play football get up go to school Peter 11:30 3:30 7:00 7:50 Jerry 11:40 5:00 7:10 8:00 Practice 04 Group work When do you go home? I go home at 11:30. When do you play football? At 4:30. Names go home play football get up go to school Peter 11:30 3:30 7:00 7:50 Jerry 11:40 5:00 7:10 8:00 Judy 11:30 4:30 Practice 04 Group work When do you get up? I get up at 7:00. When do you go to school? At 8:00. Names go home play football get up go to school Peter 11:30 3:30 7:00 7:50 Jerry 11:40 5:00 7:10 8:00 Judy 11:30 4:30 7:00 8:00 Production 05 Let’s learn:地球的自转与公转 Production 05 Let’s learn:地球的自转与公转 Production 05 Culture connection School time for students in different countries: Countries School Time China 8:00 a.m.--4:00 p.m. UK 9:00 a.m.--3:00 p.m. USA 8:00 a.m.--2:00 p.m. Learning tips 上午 a.m. 下午 p.m. Summary 06 Key words: half,past,get,when,o’clock,breakfast,home Key phrases:get up,go to school,go to bed,go home,play football,have breakfast Key sentences:1.When do you get up? I get up at+数字(+o’clock). I get up at half past+数字 I get up at+小时数字+分钟数字 2.It’s time to get up. Homework 07 基础巩固作业: 用"When do you ...? I... at +时间"句型写3组关于日常活动的句子，如起床、上学、睡觉等。 创意实践作业: 制作"My Day"时间计划表，用英语标注每个时间段的活动，下节课带来分享展示。 拓展阅读作业: 搜集资料，了解更多关于地球自转公转产生的地理现象。 null 2025-05-08 10:07 37198.418 null Other 2507.756 null 2025-05-08 10:07 92657.555 Lavf58.20.100 Lavf58.46.101 $nullnullnullSing a . song. It's time to get up. It's time to get up. Wake up. 铁头，我是他，一次弹就变好，一次它就变好，seven hundred and seven hours. 天空天天我就是他就it's seven four is seven eight。 null