18.The benefits of vitamins and minerals are emphasized because they play an important role in maintaining good health.
(A) helping
(B) keeping
(C) predicting
(D) starting

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統計： A(9), B(97), C(13), D(9), E(0) #693855

詳解 (共 1 筆)

#2457197
這裡的maintain是維持的意思，四個...
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