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Unit 4 Lesson 12 Healthy Bones
教学目标
1.通过阅读，获取关于骨骼以及如何保持骨骼健康的信息;
2.运用表格信息，口头介绍保持和增强骨骼健康的方式。
核心素养
实践创新
1.实践创新：通过阅读课文,获取关于人体骨骼重要性、骨骼结构和如何保持骨骼健康的信息;
2.技术运用：使用获取的信息和语言，用英语口头介绍人体骨骼以及如何保持骨骼健康;
教学重点
体会骨骼健康的重要性，增强健康生活的意识
教学难点
化骨骼特点和功能的信息，增强保持和增强骨骼健康的意识，并在今后的饮食口，注重营养搭配;在日常生活口，注重加强体育锻炼
教学过程
一、导入新课
Discussion
How much do you know about your bones
How to keep your bones healthy
人的骨头，早在胎龄二月时就开始形成。此后不断生长，女子到二十岁左右骨头才停止生长，男子则长到二十五岁左右。
人的骨骼，一般在十八岁左右长度就稳定了，也就是说不会再长高了。但是，骨的密度还要继续增加。四十岁后，骨的密度就开始显示出下降的趋势。下降的快慢，则要看人的体质情况而定。一般是体力活动多或喜好运动的人缓慢些。
人的骨头，早在胎龄二月时就开始形成。此后不断生长，女子到二十岁左右骨头才停止生长，男子则长到二十五岁左右。
人的骨骼，一般在十八岁左右长度就稳定了，也就是说不会再长高了。但是，骨的密度还要继续增加。四十岁后，骨的密度就开始显示出下降的趋势。下降的快慢，则要看人的体质情况而定。一般是体力活动多或喜好运动的人缓慢些。
二、新课讲解
although & but
although, but conj.
although的意思是“尽管，虽然”，用来引导让步状语从句，在一般情况下可以和though互换，但though比较口语化，而although较为正式，另外although的语气比though重。当although / though引导的从句放在句首时，主从句之间要用逗号隔开。 but引导的从句多放在主句后。
Although / Though he was tired, he kept on working.
虽然他已经累了，但仍然继续工作。
He often helps me with my English although he is quite busy.
尽管他相当忙，但是还常常帮我学英语。
His office is in New York, but he is often away.
他的办公室在纽约，但他经常不在。
注意： although和though引导的从句不能与but连用，但可以互换。 如：
Although we are poor, we are still happy.
= We are poor, but we are still happy.
我们虽然穷，但是活得很开心。
Choose the main idea of each part.
Part 1(para.1-2)
A. Bones are light but very strong.
B. The introduction of bones.
Part 2(para.3-5)
Calcium can make bones solid.
D. Ways to keep bones healthy.
Read the first paragraph and answer three questions.
Why can bones support our weight
1.Why are bones important
Because they support our bodies and help us move freely.
2. Are our bones light
Yes, they are.
3. Can bones support our weight
Yes, they can.
Read the second paragraph, draw a picture of bone structure and take some notes.
Grammar
Look at the Sentence Builder.
Although they are light, bones are strong enough to support our weight.
2. Bones are hard on the outside, but they are soft on the inside.
although意为“虽然，尽管”，通常位于句首。
but意为“但是”，通常位于句中。
They are light, but bones are strong enough to support our weight.
=Although they are light, bones are strong enough to support our weight.
【注意】although与but不能同时用于一个句子中。
Find more sentences contains “Although or but”, and change them into another forms.
Look at the Sentence Builder.
Bones are important because they help us move freely.
= Bones help us move freely, so they are important.
because意为“因为”，表示原因。
so意为“因此，所以”，表示结果。
【注意】because与so不能同时用于一个句子中。
Find more sentences contains“because or so”, and change them into another forms.
1.What are bones like Fill in the blanks.
Bones are…
Although they are very light, bones are strong enough to support our weight.（para.1 line7）
Paragraph 2
2.Why are bones important
Paragraph 1
Every time we walk, sit down or hold a book, we are using our bones. Bones are important because they support our bodies and help us move freely. Although they are very light, bones are strong enough to support our weight.
Paragraph 2
Bones are hard on the outside, but they are soft on the inside. The soft part of the bone makes our blood. Blood carries nutrients through our body. It also helps move waste materials away so our body can stay healthy.
Why are bones important
Because they support our bodies and help us move freely. And the soft part of the bone makes our blood.
3.Why is blood important
Paragraph 2
Bones are hard on the outside, but they are soft on the inside. The soft part of the bone makes our blood. Blood carries nutrients through our body. It also helps move waste materials away so our body can stay healthy.
三、作业
pairwork
Choose a circle. Guide your partner to the circle by reading the words aloud.

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