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probable语气比 possible强，“可能性”最大，指有根据、合情理、值得相信的事物，带有“大概、很可能”的意思。如:
I don't think the story is probable.
7. at ease
【课文原句】A smile is the universal facial expression — it is intended to put people at ease. (P29)
【名师点拨】at ease是个固定词组，意思是“处在舒适、自由自在的状态下”。本句中put people at ease意为“使人自由自在；不拘束”。如：
Her mind was at ease, knowing that the children were safe.
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