找出画线部分发音不同于其他三个单词的序号.
(1)A short        B. doctor      C. actor    D. visitor
(2)A who         B. why         C. whose     D. whom
(3)A peach       B. bread       C.tea        D.seat.
(4)A cinema       B.clock       C.clean      D.crop
(5)A clothes      B.that        C.thank     D.those