9. Farms _____ the use of chemical pesticide and fertilizers to ensure the safety of organic foods.
(A) maintain
(B) nominate
(C) reinforce
(D) eliminate
(E) coordinate
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統計: A(11), B(7), C(15), D(92), E(3) #939318
統計: A(11), B(7), C(15), D(92), E(3) #939318