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He feels as though everything around him is spinning. (他觉得天旋地转。)
He has noticed some loss of hearing. (他觉得自己的听力变差了。)
She has some pains and itching around her eyes. (她眼睛四周又痛又痒。)
He has been coughing up rusty or greenish-yellow phlegm. (他咳嗽带有绿黄色的痰。)
His eyes feel itchy and he has been sneezing. (他眼睛发痒，而且一直打喷嚏。)
He has a fever, aching muscles and hacking cough. (他发烧、浑身酸痛，并伴有干咳。)
He gets a cold with a deep hacking cough. (他伤风感冒，还伴有剧烈的干咳。)
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