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.( )
A、cake
B、gas
C、bag
D、tax
47. Where is the passage most probably taken from?
A、A novel.
B、A tourist guide.
C、. A product catalog.
D、A biography.
49. What does the sentence “it all went downhill" in Paragraph 3 mean?