string(303) "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%E8%80%83%E8%AF%95%E5%8E%86%E5%B9%B4%E7%9C%9F%E9%A2%98%E7%9C%8B%E5%87%A0%E5%B9%B4%E6%AF%94%E8%BE%83%E5%90%88%E9%80%82 => Failed to connect to 101.89.159.206 port 38100: Connection refused"
中级考试历年真题看几年比较合适
