_云南成考网

(57)___

Directions:In each of the following groups of words,there are four underlined letters or letter combinations marked A,B,C and D.Compare the underlined parts and iden-tdtify the one that is different from the others in pronunciation.Mark your answer by blackening the corresponding letter on the Answer Sheet.

• A、combination
• B、climbing
  
• C、bamboo
• D、ambition

51.What is this passage mainly about?

• A、A World Fair held in Chicago in 1893.

• B、The popularity of the American candy bar industry.

• C、The candy bar industry during World War I.

• D、The spread of the candy bar business to the Midwest.