选出画线字母读音不同的序号
（1）A. radio        B. make       C. name       D. any
（2）A. borrow        B. hockey     C. observe     D. on
（3）A. study         B. student    C. excuse      D. use
（4）A. recorder      B. red        C. remember    D. eleven
（5）A. trip         B. ill        C. violin      D. sing
（6）A. toothpaste    B. too        C. look        D. zoo
（7）A. elbow        B. know       C. flower      D. window
（8）A. mouths       B. months     C. bikes      D. caps