52. What is the main reason for reducing salt in food?
A、To improve the flavor of food.
B、To decrease the time for processing food.
C、To extend the shelf-life of food.
D、To protect people against heart diseases.
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
10. Mary demanded that he _____ the books he borrowed from her a month ago.