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 answerby blackening the corresponding letter on the Answer Sheet
A、actress
B、business
C、excess
D、endless
20.In October 2007,the Chang'e-l satellite was successfully __at Xichang.
A、launched
B、presented
C、regulated
D、engaged
55.What is the purpose of publishing Twain's autobiography?