如图是草原生态系统的食物链和食物网结构示意图，据图回答下列问题．
A good listener takes part in the conversation, ______ ideas and raising questions to keep the talk flowing.
Most people are ____ that the 18th National Congress of the Communist Party of China is one of the most important meetings in history.
已知tanβ=sin39°19′+cos80°10′，则锐角β≈____ （结果精确到1′）．
________ great fun they had!
