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
36. Which of the following is people' s natural response to pain?
A、They tend to feel worried and frightened.
B、They want to make sure it won't last long.
C、They prefer to forget the bad memories.
D、They try to find out what may cause pain.
52. What is the main reason for reducing salt in food?