题目

阅读理解 IPhone owners are vainer（虚荣）and spend more on clothes and grooming（仪容）than those who have BlackBerrys and Android phones, new research claims.BlackBerry owners earn the most and are more likely to have long-term relationships, while people with Android handsets are most creative and the best cooks. The study, carried out by TalkTalk Mobile, surveyed 2,000 owners of the three major smartphone brands to determine whether the choice of handset was an extension(延伸) of their personality. The study rated users in various walks of life using a point scoring system inc8、下列说法正确的是（　　）A、等边三角形既是轴对称图形，又是中心对称图形B、等边三角形既是旋转对称图形，又是中心对称图形C、等边三角形既是旋转对称图形，又是轴对称图形D、等边三角形是轴对称图形，但不是旋转对称图形