16. speech, talk, lecture
speech指在公共場所所做的經(jīng)過準備的較正式的演說，talk日常生活中的一般的談話，講話，lecture學(xué)術(shù)性的演講，講課 a series of lecture on...

17. officer, official
officer部隊的軍官，official政府官員 an army officer

18. work, job
二者均指工作。work不可數(shù)，job可數(shù) a good job

19. couple, pair
couple主要指人或動物，pair多指由兩部分組成的東西 a pair of trousers

20. country, nation, state, land
country側(cè)重指版圖，疆域，nation指人民，國民，民族，state側(cè)重指政府，政體，land國土，國家 The whole nation was sad at the news.

21. cook, cooker
cook廚師，cooker廚具 He is a good cook.

22. damage, damages
damage不可數(shù)名詞, 損害，損失; damages復(fù)數(shù)形式, 賠償金 $900 damages

23. police, policeman
police警察的總稱，后接復(fù)數(shù)謂語動詞，policeman 指某個具體的警察 The police are questioning everyone in the house.

24. problem, question
problem常和困難連系，前面的動詞常為think about, solve, raise，question常和疑問連系，多和ask, answer連用

25. man, a man
man人類，a man一個男人 Man will conquer nature.

26. chick, chicken
二者均可指小雞，chicken還可以當雞肉 The chicken is delicious.

27. telegram, telegraph
當電報解時，telegram指具體的，telegraph指抽象的 a telegram, by telegraph

28. trip, journey, travel, voyage
travel是最常用的，trip指短期的旅途，journey指稍長的旅途，voyage指海上航行 a three-day trip

29. sport, game
sport多指戶外的游戲或娛樂活動，如打球，游泳，打獵，賽馬等；game指決定勝負的游戲，通常有一套規(guī)則 His favorite sport is swimming.

30. price, prize
price價格，prize獎，獎品，獎金 win the first prize The price is high/low.