阿摩線上測驗
13. It is a _______ fact that physical exercise contributes significantly to mental well-being and stress reduction.
(A) dubious
(B) manifest
(C) precarious
(D) speculative
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統計： A(2), B(28), C(5), D(6), E(0) #3873863
統計： A(2), B(28), C(5), D(6), E(0) #3873863
