【题目】Over the years, people have learned from ants that teamwork and perseverance are indeed two key ______ to success.
A. certificates B. ingredients
C. approaches D. instructions
在线课程【答案】B
【解析】
试题分析：A. certificates证书；B. ingredients配料；C. approaches方法；D. instructions指导；句意：多年来，人们从蚂蚁那里学到，团队精神和毅力，的确是成功的两个关键要素, 故选B。