53. What can be inferred about people' S use of salt in the past?
A、People used salt to control blood pressure.
B、People ate much salt in their average diet.
C、People were clear about the harmful effect of salt.
D、People didn't eat so much salt as we do today.
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.( )