题目

生态系统中的能量可以沿着下列哪条链正常流动：（    ） A．草→食草昆虫→青蛙→蛇        B．草→吃虫鸟→鼠→青蛙 C．草→兔→食草昆虫→猫头鹰     D．狐→兔→蜘蛛→草 答案：AMs Liu saw a fashion dress in a shop which set her heart racing. However, its price was far beyond her _______. A. range B. certainty C. reach D. contact