50.What does the underlined word "seat”in the last paragraph most probably mean?
A、Focus.
B、Position.
C、Chair.
D、Center.
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.
A、captain
B、obtain
C、contain
D、retain
48.Why did M.S.Hershey start the production of chocolate bars?
A、He was deeply impressed by the Columbian Exposition.
B、He realized that it was possible for chocolate to become popular.
C、There was nothing to produce in his factory in Lancaster.
D、He was interested in the chocolate machinery displayed at the fair.