Makes telesal page black and shows only who wants to answer. Good to the podium. Use dolphin and tempermonkey add-on to make it work on android devices.
当前为
Use this dolphin version for android
https://docs.google.com/file/d/0BxE4k4xEiNO2M2l6Q3pWUThueWM/edit?usp=docslist_api
And tampermonkey plugin
https://docs.google.com/file/d/0BxE4k4xEiNO2UWo3aXkySUp4aVU/edit?usp=docslist_api
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