28. Mosquito population in Costa Rica increases because __________.
(A) Mosquitoes grow fast.
(B) Mosquitoes cannot resist common insecticides.
(C) Mosquitoes’ predators grow fast.
(D) Mosquitoes’ predators cannot resist common insecticides.
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蚊子數量增長原因並非來自繁殖，而是說蚊子...
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