--May I have a talk with one of your sports reporters? --Sorry, but all of them are out to_______the main events of the day. A. getB. find C. coverD. search 答案:Ccover the events采访这些事件。
生态系统的营养结构是指
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A.
以营养为纽带形成类群间的结构联系
B.
生物间的单方向食物联系
C.
生物间的多方向食物联系
D.
生态系统中物质循环和能量流动的渠道