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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.

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11. You'd better take these documents with you __ you need them for the meeting.

• A、 unless 

• B、in case

• C、until

• D、so that