单选题
Many animals are on the ______ of disappearing from the face of the earth and zoos can provide them with a safe place to live and breed.
【正确答案】
B
【答案解析】[解析] A项“range”意为“山脉；排，行，走向”；B项“verge”意为“边，边沿，边缘”；C项“part”意为“一部分，组成部分”；D项“link”意为“连接，纽带”。句子是说许多动物濒临灭绝，因此选择B。