Ex1:Choose the word whose primary stress is different from the others. 16. A. kangaroo B. employee C. popular D. preparation 17. A. national B. medical C. historical D. chemical 18. A. traffic B. agree C. noisy D. student 19. A. listen B. visit C. borrow D. obey 20. A. Chinese B. Japanese C. historic D. biology 21. A.creativity B.immature C.negative D.nationality 22. A.impossible B.importantly C.stability D.connectivity 23. A.unlimited B.illogical C.conservation D.priority 24. A.opportunity B.competitive C.communicative D.unfortunate 25. A.authority B.impolite C.unhealthy D.repetitive

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