string(257) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%AD%E7%BA%A7%E7%99%BE%E9%A2%98%E6%96%A9%E7%BD%91%E6%A0%A1%E5%A5%BD%E4%B8%8D%E5%A5%BD => Failed to connect to 101.91.112.32 port 38162: Connection refused"
中级百题斩网校好不好
