Despitehavingreceivedpositivereviewsbyindustrycritics,salesofthedigitalMP3playerhavebeenquite_______(disappoint).
甲乙丙三人各自拥有不超过10本图书,甲丙购入2本图书后,他们拥有的图书数量构成等比数列,则能确定甲拥有图书的数量
(1)已知乙拥有的图书数量
(2)已知己拥有的图书数量
Studentsenrolledasfull-timecanfully____intheuniversityextracurricularclubs.