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播放、暂停点击小喇叭按钮。黑体加粗重点句可点击，实现点读。
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Classes begin. 开始上课
Let’s sing
Back
The earth is our mother. We must take care of her.
The earth is our mother. We must take care of her.
Sha la la la, la la la, sha la la la la.
The earth is our mother. We must take care of her.
The earth is our mother. She will take care of us.
The earth is our mother. She will take care of us.
Sha la la la, la la la, sha la la la la.
The earth is our mother. We must take care of her.
The Earth Is Our Mother
My day
Unit 5
Rules：When you see the numbers, say it loudly and quickly.
(快速响亮地说出你看到的数字）。
Let’s play
Let’s play
7
8
4
40
30
20
3
:
30