必修5Unit 1 Great Scientists 泛读课
2. 让学生快速阅读课文，并标出疑点难点。
3. 让学生讨论 46 页的 4 个问题。
Answer key to these four questions:
· Figure 1 has an Euler path.
· Figure 2 has an Euler path.
· Figure 3 doesn't have an Euler path as it has more than two odd points.
· Figure 4 has an Euler path.
第七步 释疑
1. To his surprise, he found that he could cross six of the bridges without going over any of the
www.xuehuiba.comm twice or going back on himself, but he couldn't cross all seven.
令他惊奇的是，他发现在不走两次或回头路的情况下，只能同时穿过六座桥却不能穿过所有的七座桥。
cross: vt. 穿过，横过
The soldiers took three days to cross the desert. 士兵们用了三天时间穿过沙漠。
Make sure there's no traffic before you cross the road. 在你穿行马路前确认没有车辆经过。
Across: prep. ① 横过，穿过
They built a bridge across the river. 他们在河上建了一座桥。
② 在……对面
They live just across the school. 他们就住在学校的对面。
crossing: n. 十字路口；交叉点；交叉口
2. He joined these points together using curved lines to go over the bridges. 他用穿过这些桥的曲线把这些点连接起来。
句中 using curved lines 是作方式状语。
They crossed the river using a
small boat. 他们划着小船穿过了河。
第八步 作业布置
1
www.xuehuiba.com. 准备课本第七页的 Writing。
2. 复习本单元的知识点和语法。
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