找出下面单词中意思不同类的一个，把它的序号写到前面的括号里。
(   ) 1. A. Tuesday    B. week    C. Friday    D. Monday
(   ) 2. A. play       B. do      C. read      D. tree
(   ) 3. A. dance      B. young   C. sing      D. speak
(   ) 4. A. wonderful  B. plant    C. clock     D. cartoon
(   ) 5. A. salad      B. hot     C. fresh     D. thirsty