string(255) "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%E6%9C%89%E5%BF%85%E8%A6%81%E5%81%9A%E6%A8%A1%E6%8B%9F%E5%8D%B7%E5%90%97 => Failed to connect to 14.18.46.51 port 38206: Connection refused"
二建有必要做模拟卷吗
