50.What does the underlined word "seat”in the last paragraph most probably mean?
A、Focus.
B、Position.
C、Chair.
D、Center.
47.What is the best title for the passage?
A、Credit-a Way of Life in America.
B、Credit Services in America
C、Convenience of Living in America
D、History of Credit Cards in America
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.