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.
I.Phonetics(5 points) 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.