而且这个文件比较大，39kb
前面加了井号键的，就是被作废的一行。
你的这个hosts文件不是原版的，已经被修改过了，可能是病毒修改的，也可能是一些安全工具软件修改的。
如果想恢复原样，用以下内容替换hosts文件的内容（以井号键开头的几行全部可以删除不用）：
# Copyright (c) 1993-1999 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host
127.0.0.1 localhost
你的这个hosts文件不是原版的，已经被修改过了，可能是病毒修改的，也可能是一些安全工具软件修改的。
如果想恢复原样，用以下内容替换hosts文件的内容（以井号键开头的几行全部可以删除不用）：
# Copyright (c) 1993-1999 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host
127.0.0.1 localhost
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