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
52.According to Paragraph 1,which of the following statements is TRUE of Mark Twain?
A、He left behind lots of money.
B、His works were written for children.
C、His works are full of adventures.
D、He is famous for his great works.
53.What can we learn about Mark Twain's autobiography from the passage?