互动封闭仿真课堂
1、智能交互 2、电子板书式视频教学 3、在线互动问答 4、封闭课堂启发式教学方式
随堂测试、知识梳理、易错点揭示、总结启迪智能错题本
听课中的错题能自动加入错题本,课后可方便复习及导出错题本升级服务
在线答疑、课后同类题练习、讲义下载、短信提醒35. on their travels 在旅行时
36. in the open air 在户外
37. for free 免费 a free meal
He is free with his money.
All these books are given away (for) free/free of charge.
The old woman has never been free from pain.
You are free to do anything you like, within the law.
1. There be… left 有…剩下
2. hunt animals for food 为得到…而捕猎… hunt for 搜寻 hunt animals 狩猎
3. know of/about 对…了解
4. in danger 处于危险中 out of danger 脱离危险 in danger of 面临...的危险
endanger vt. 使...濒危;危害 endangered animals 濒危动物 become endangered
5. die out 灭绝; 消失 die away ; die off; die of; die from; die down be dying for 渴望;很想