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6. … planting peanuts that use the ground’s surface followed by vegetables that put down deep roots.
7. Some organic farmers prefer planting grass between crops to prevent wind or water from carrying away the soil, and then leaving it in the ground to become a natural fertilizer.
8. This also keeps the air, soil, water and crops free from chemicals.
9. In addition, fruit, vegetables and other food grown with chemical fertilizers usually grow too fast to be full of much nutrition.
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