I.指出每组单词中与其他三个不同一类的单词，并把它的编号写在相应的括号内：（5分） ( ) 1, A. river B. eat C. worry D. stay ( ) 2, A . pear B. apple C. flower D. banana ( ) 3, A. bread B. milk C. table D. egg ( ) 4, A. one B. two C. first D. four ( ) 5, A. tell B. say C. cook D. father