Directions:In each of the following groups of words,there are four underlined letters or let-ter 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、pension
B、mission
C、tension
D、revision
49.Which event brought the booming of American candy bar business?
A、The adding of new materials.
B、The demand in the army during WWI.
C、The purchase of new machines.
D、The appearance of smaller candy bars.
46.What advantage can credit card holders have?
A、They can choose not to pay for their purchases.
B、They can easily borrow money at a lower interest.
C、They can own something before they actually pay for it.
D、They can pay only a small amount of what they owe.