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三、Read and judge. Dongdong 正在逛一家文具店。请你读一读，根据对话内容，判断下列句子是(√)否(×)正确。
Dongdong: Excuse me. How much is this pen?
Shopkeeper(店主): It's nine yuan.
Dongdong: OK. I'll take two.
Shopkeeper: Eighteen yuan, please. Anything else(还要别的吗)?
Dongdong: Yes. How much is this notebook(笔记本)?
Shopkeeper: Six yuan. How many do you need?
Dongdong: I need three. How about three for fifteen yuan?
Shopkeeper: OK.
( )1. Dongdong pays eighteen yuan for two pens.
( )2. Dongdong needs two notebooks.
( )3. Dongdong pays five yuan for three notebooks.
( )4. Dongdong buys(购买) three pens and two notebooks.
Dongdong: Excuse me. How much is this pen?
Shopkeeper(店主): It's nine yuan.
Dongdong: OK. I'll take two.
Shopkeeper: Eighteen yuan, please. Anything else(还要别的吗)?
Dongdong: Yes. How much is this notebook(笔记本)?
Shopkeeper: Six yuan. How many do you need?
Dongdong: I need three. How about three for fifteen yuan?
Shopkeeper: OK.
( )1. Dongdong pays eighteen yuan for two pens.
( )2. Dongdong needs two notebooks.
( )3. Dongdong pays five yuan for three notebooks.
( )4. Dongdong buys(购买) three pens and two notebooks.
答案
1.√ 2.× 3.× 4.×
四、Do and say. 同学们正在玩“比比谁算得快”的游戏。快和你的小伙伴一起照样子做一做、说一说吧！
答案
示例：
加法（Addition）
1. Two and three makes... Five.
2. Four and five makes... Nine.
3. Seven and eight makes... Fifteen.
4. Ten and ten makes... Twenty.
减法（Subtraction）
1. Five minus two is... Three.
2. Nine minus four is... Five.
3. Fifteen minus seven is... Eight.
4. Twenty minus ten is... Ten.
