The OP also did not say anyting about filling out surveys in exchange for free things. for free is normally inaccurate. I am not passing judgement about whether its use is Erroneous or inccorect.知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。A person remaining point. The equipment retains tellin