题目

如图是某个农业生态系统的结构模式图，该图中表示生态系统能量流动的 箭头是 A．①③ B．②③⑤    C．①③④       D．①②③④⑤ 答案：C 解析: 略—I am going to travel to Jamaica. Would you consider telling me about your experiences there? —_         _. Let's discuss it over dinner. A. That's all right             B. Go ahead           C. By all means     D. It just depends