①能用量角器量指定角的度数，能画指定度数的角，会用三角尺画30°，45°，60°，90°角。

②探索并掌握三角形、平行四边形和梯形的面积公式，并能解决简单的实际问题。 ③知道面积单位：千米2、公顷。

④通过操作，了解圆的周长与直径的比为定值，掌握圆的周长公式;探索并掌握圆的面积公式，并能解决简单的实际问题。 ⑤会用方格纸估计不规则图形的面积。

⑥通过实例了解体积(包括容积)的意义及度量单位(米3、分米3、厘米3、升、毫升)，能进行单位之间的换算，感受1米3、1厘米3以及1升、1毫升的实际意义。

⑦结合具体情境，探索并掌握长方体、正方体、圆柱的体积和表面积以及圆锥体积的计算方法，并能解决简单的实际问题。

⑧体验某些实物(如土豆等)体积的测量方法。 (2)教学目标

知识与技能目标：理解体积的含义并认识常用的体积单位：立方厘米、立方分米、立方米;初步了解体积单位与长度单位、面积单位的区别与联系。

过程与方法目标：学生能够通过探索体积单位的学习过程，发展解决问题的策略，积累教学活动经验，发展数学思考。

情感态度与价值观目标：学生能进一步体验数学与生活的紧密联系，在学习过程中，体验获得成功的乐趣。 (3)导入环节的设计

利用多媒体播放乌鸦喝水的定格动画。动画播放完毕后，引导学生思考：乌鸦是怎么喝到水的?为什么把石头放进瓶子里，瓶子里的水就升上来呢? 预设：因为石头占据了水的空间，所以把水挤上来了。

设计意图：采用多媒体播放动画的方法激发学生的学习兴趣，引起学生的有意注意。通过教师的问题引导将所要学习的数学问题进一步具体化、形象化。使学生感受到数学与生活的紧密联系，同时也激发学生爱观察思考的热情。

28.参考答案

(1) Key points:

Words: The meaning and the pronunciation of the words such as “light, heavy, big, small...”.

Target language: “It’s heavy/small/big and light...”. Difficult Points:

How to give suggestions when shopping and describe things’ feature by using the correct sentence structure “It is…”. (2)

Knowledge aims:

Students can understand the meaning of new words about describing objects like “light, heavy, big, small...”.

Students can master the sentence structure: “It’s heavy/small/big and light...”.

Ability aims:

Students can use the sentence structure by listening and reading some easy sentences.

Students can describe things’ feature and give some advice. Emotional aims:

Students would love to know more about the features of many things in daily life. Students will be more confident when communicating with others in English. (3)Warming up and Lead-in

Greet students as usual and play a song about travelling. Ask them some questions like if you want to travel, what luggage should you bring? And lead students to answer the question and lead in the topic.

(设计意图：通过播放歌曲和提出问题可以吸引学生的兴趣和注意力，发散思维并很自然过渡到本节课所学话题) Presentation

Show some clips to teach “light, heavy, small, big...”; Show some real objects like cup and lead students to describe it: It’s heavy... It’s light...

Then ask students to read the words and sentences one by one after the teacher in different ways.

(设计意图：通过不同的方式呈现单词和句型，增加单词教学的趣味性，让学生更容易接受和掌握;利用实物呈现句型，活动的衔接性较好。)

Practice

Activity 1 High and Low voice

Lead students to read the sentences: It’s heavy... It’s light... on the blackboard. When teacher reads sentences in a low voice, students should read in a loud voice and vice versa.

Activity 2 Do an antonym match heavy big small light

Then work in pairs to role play the dialogue.

(设计意图：采用游戏的方式练习句型能够增强句型学习的趣味性，寓教于乐，增强单词的识记效果;通过连线的方式，不仅能够巩固句型还能锻炼学生的反应能力，也能锻炼学生的听力。) Production

Let students make a dialogue by using some words about describing objects and sentence patterns in groups of two: It’s... and choose some groups as representatives to give a performance and teacher gives some positive comments. (设计意图：通过小组活动的方式培养学生的团队合作能力和团队意识，让学生将所学知识运用到日常生活中去，符合新课标培养学生的综合语言运用能力的标准。)

29.参考答案

(1)歌曲特点