I:Choose the word that has the underlined part pronounced differently from the others
1.A.obey B.safety C. plane D.traffic
2.A.disappointed B.frightened C.amazed D.annoyed
3.A.expensive B.convenient C.plentiful D.celebrate
II:choose the word that has the main sterred syllable diferently from the others
1.A.obey B. perform C.distance D.visit
2.A.pollution B.effective C.limited D.renewable