11. What is the study mentioned in the passage mainly about?
(A) Level of education and achievement
(B) Health and other aspects of life
(C) Income and social status
(D) Marriage and happiness
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統計: A(25), B(450), C(43), D(100), E(0) #2027101
統計: A(25), B(450), C(43), D(100), E(0) #2027101