L3-U3-P1-1 Listening :Life & Conditions 1生命与环境条件1 There are many forms o...

L3-U3-P2-1 Listening :QuickServe 1 快服务公司 1 QuickServe is a home repair c...

L3-U3-P3-1 Listening :Harry’s Business Trip 1哈里的旅行 1 Harry is on a busin...

L3-U3-P4-1 Listening :Leonardo da Vinci 1莱昂纳多·达·芬奇 1 Leonardo da Vinci i...

L4-U1-P1-1 Listening :Visiting a Friend 1 会友 1 Christina is on a two-wee...

L4-U1-P2-1 Listening :A Trip to Yosemite Park 1 优胜美地公园之旅 1 Today Christi...

L4-U1-P3-1 Listening :Harry's Trip 1 哈里的旅行 1 Harry is an American busine...

L4-U1-P4-1 Listening :QuickServe 2.0 快速服务2.0 Quickserve is a successful ...

L4-U2-P1-1 Listening :Extinction Events 1 灭绝事件1 The Earth was formed abo...