题目

For Dave Moody, the combination of a good education, his wife, and a passion for architecture, led him to be a successful business owner. Moody decided he had a passion for  21  ， so he used his knowledge of architecture as a(n) 22   in the construction business.   23  ，  just weeks after accepting his dream job and relocating his family to Atlanta, the company that _ 24  him went under. Dave often says, “What was my worst day became my  25   day.” With nothing left to lose, he  26  his own business. Today, that business has  27  into the C. D. Moody Constructi下列不属于共生现象的是（　　）A. 地衣中的真菌和藻类 B. 人体肠道大肠杆菌制造维生素C. 生活在牛胃中帮助消化的菌类和牛 D. 生活在人的小肠中蛔虫