52. What does the underlined word "centenarians" in Paragraph 1 refer to?
A、People who have secret lifestyles.
B、People who enjoy physical exercise.
C、People who are one hundred years old or older.
D、People who carry the gene for being slim.
23.
A、miss
B、reduce
C、increase
D、lose
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 iden-tify the one that is different from the others in pronunciation. Mark your answerby blackening the corresponding letter on the Answer Sheet.