题目

       Illegally traded endangered species that escape, forming secondary populations, offer hope to their long-tem survival, a study suggests. This first came to my attention when I read a news story about the seizure of an illegal shipment of 23 yellow crested cockatoos（小葵花凤头鹦鹉）, said Luke Gibson, a college teacher. He learned that the species was critically endangered, which surprised him.        This encouraged Dr. Gibson and his colleague to investigate（调查）how a critically endangered species had become self-sustaining outside of its natural 拉丁美洲面积最大、人口最多的国家是(    )A．阿根廷B．巴西C．秘鲁D．委内瑞拉