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 identify the one that is different from the others in pronunciation. Mark your answer by blackening the corresponding letter on the Answer Sheet.1.( )
A、cake
B、gas
C、bag
D、tax
17. The young mother _____ ever gets a chance to study,except when the children have gone to bed.
A、hardly
B、almost
C、only
D、nearly
15. Susie’s experience is unusual _____ she travelled 20 countries in only one month.