12. Which of the following is true about the study?
(A) It is done by adults in the neighborhood of the university.
(B) The data collected are all from Harvard graduates.
(C) Its findings are surprising only to the readers.
(D) It reveals the importance of relationships to health.
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統計: A(42), B(67), C(47), D(493), E(0) #2027102
統計: A(42), B(67), C(47), D(493), E(0) #2027102