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

20.In October 2007,the Chang'e-l satellite was successfully ＿＿at Xichang.

• A、launched

• B、presented

• C、regulated

• D、engaged

(59)__