string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%8C%E5%BB%BA%E8%80%83%E8%AF%95%E5%88%B7%E7%9C%9F%E9%A2%98%E8%BF%98%E6%98%AF%E6%A8%A1%E6%8B%9F%E9%A2%98 => Failed to connect to 101.89.159.206 port 38075: Connection refused"
二建考试刷真题还是模拟题
