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