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参考解析：
刷刷题刷刷变学霸
举一反三
【单选题】One of the most exciting features of the Digital Divide Network website is the ability for every DDN member to have a personal blog(网络日志). Blogs contain journal entries written by the author, who’’s r...
A.
To discuss the impact of blogs on our society.
B.
To promote a new bogging tool.
C.
To introduce several kinds of blogging tool.
D.
To instruct how to write one’’s personal blog.
【单选题】利他行为是指（）.
A.
一种对别人有好处的行为
B.
一种自觉自愿的、对别人有好处的行为
C.
一种对别人有好处，没有明显自私动机的行为
D.
一种对别人有好处，没有明显自私动机的、自觉自愿的行为