13. There is still a healthy market for ivory, causing rampant poaching in some national parks.
(A) gradual
(B) uncontrollable
(C) fortified
(D) unpleasant
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統計:
A(11), B(72), C(24), D(9), E(0) #1598254
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13. 象牙仍有健康的市場,導致一些國家...