11.青少年團體常為了區隔與他人的差異，而發展出獨特的語彙與價值觀，此種是屬於下列何種文化現象？(A)領導文化 (B)主流文化 (C)次級文化 (D)時尚文化

1. (8%) Which of the following statements is (are) not correct? (A) The demand curve of a normal good must be downward sloping. (B) The Engel curve of a neutral good must be upward sloping. (C) The demand curve of a Veblen good must be downward sloping. (D) The Engel curve of an inferior good must be upward sloping. (E) A Giffen good must be an inferior good.