[解析]
(1)C 细节理解题.根据最后一段 These days are set aside to show love and respect for parents..They give love and care,人们向父母表达爱意,故A正确;On Mother's Day people wear carnations,人们佩戴康乃馨,故B正确;Many people attend religious services to honor parents人们在这一天会参加祭祀活动纪念父母,故D正确.有些父母去世的人会去墓地看父母不正确,故选C
(2)B 推理判断题.从第三段最后一句话Senator Margaret Chase Smith helped to established Father's Day as a national commemorative day,in 1972 在1972年,史密斯参议员玛格丽特追求帮助建立父亲节作为一个全国性的纪念的一天,可知.故选B.
(3)D 推理判断题.从第四段 These days are set to show love and respect for parents 这些天将表达爱和尊重父母,可知.故选D.
(4)B 主旨大意题.写这篇文章的目的是介绍母亲节和父亲节.