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Modern car-making factoriess are so large that each one is really a lot of factories close together. Each workshop makes some parts. The pieces of a car body are joined together by welders(电焊工) . All the bits and pieces that make up each car are collected and put ready for the assembly line(装配线) , where they are fitted together.
51. The first motor cars were probably made by______.
A. Europeans B. the Whites C. the Blacks D. the English
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