找出画线部分发音不同于其他三个单词的一项。
(  ) 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