[解析]
(1)D.推理判断.根据第一段中的…is a clear indication that writers are held responsible for what they say.清楚地表明作家对他们所说的话负责,可判断D正确的.
(2)B.推理判断.第二段后半部分Most governments and many organizations will not process written complaints if they do not bear the writer's signature提到很多政府和组织不受理没有签名的投诉,并解释说上诉人不太严肃.所以可以推断没有回复,所以选B.
(3)B.推理判断.根据第三段There are people who wish to remain anonymous(匿名的) for various reasons是提到慈善匿名捐款的事例可知他们不想暴露在广众之下.所以答案选B.
(4)C.主旨大意.签名意味着为自己的话负责,文章讲述了签名的重要性及签名的责任.故选C.