Paul's poor performance in the interview was a big ( ) to his mother, who had wanted her son to study at Harvard University.
A、act
B、blow
C、sign
D、air
31.( )
A、duty
B、impact
C、right
D、hope
I.Phonetics(5 points)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.( )