48 Which of the following is NOT one of the examples of plastic applications?
(A) Space travel.
(B) Vehicle production.
(C) Food preservation.
(D) Soil fertility.

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統計： A(176), B(88), C(94), D(563), E(0) #2099458

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#3667735
fertility 肥沃、豐饒、生產力：...
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