单选题 Some adult dogs may weigh as much as 200 pounds, but most weigh between 20 and 50 pounds.

【正确答案】 A

【答案解析】[解析] adult意为“成年的”，mature意为“成熟的”，female意为“女性的，雌的”，special意为“特殊的”，wild意为“野生的”。故正确选项为A。