先导引入课 章节测试：词汇表达法

1 题

Globalization Review Test

3 题

Life style Background information

1 题

B3U5 Thanks Giving Day lead in video

4 题

B4U2 Smart Car Lead in video

8 题

B3U6 Humanism Lead in video

3 题

How to: Get a Job B4U3 Lead in video

5 题

B4U7 Terrorism Review test

6 题