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19.Scientists say it may be five or ten years _____ it is possible to test this medicine on human patients.
A. since B. before C. after D. when
20.___ the Internet is bringing the distance between people， it may also be breaking some homes or will cause other family problems.
A. When B. If C. As D. While
21.Though he is in his sixties， ______ he works as hard as a young man
A. yet B. but C. and D. and yet
22.The two girls look ____ much alike ____ no one can tell them apart.
A. so， that B. so， and C. as， that D. such， that
一站式课程咨询服务平台
