[解析]
(1)D.细节理解题.根据文章第一段 Roger:Hi,there!It was my 15th birthday last Saturday罗杰:嗨,你好!上星期六是我15岁生日;可知他的生日时上周六;故选D.
(2)B.细节理解题.根据文章第二段 Jessica:Yes,My class was on a school field trip last week杰西卡:是的,我们班上周在学校实地考察;可知她上星期参加学校活动;故选B.
(3)C.细节理解题.根据文章第四段Martin:It was a different week than usual.Last Thursday,my school band(乐队) went to Atlanta to perform in a competition上周四,我的学校乐队(乐队)去亚特兰大参加了一场比赛.可知马丁去亚特兰大比赛中表演;故选C