36. ________ is produced in the roots of plants. It promotes cell division and growth, and retards the aging of flowers and leaves?
(A) Ethylene
(B) Abscisic acid
(C) Karrikins
(D) Cytokinins
(E) Gibberellins

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統計： A(3), B(7), C(2), D(51), E(4) #1122138

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