51. Which of the following is NOT mentioned in the passage as one of the ways to enhance happiness?
(A) Setting up an exercise routine.
(B) Holding a positive attitude toward your future.
(C) Traveling abroad with friends on a regular basis.
(D) Showing appreciation for people you are grateful for.
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統計: A(0), B(0), C(0), D(1), E(0) #3363305
統計: A(0), B(0), C(0), D(1), E(0) #3363305