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20.C由图可知，赤松茸接种在以秸秆发酵的栽培基料上，属于该生态系统中的分解者，A正确；菌糠和秸秆由废弃物变为了生产原料，实现了物质的循环利用，B正确；该模式充分利用了秸秆中的能量，从而提高能量的利用率，但不能提高能量的传递效率，C错误；该模式可以减少化肥的使用量，进而降低对环境的污染，D正确。

书面表达One possible version:Dear Mike.I am delighted to learn that you are coming to study in China.In your letter you asked how to prepare forthe HSK.I am writing to offer you some advice.First of all.you are supposed to enlarge your vocabulary.As we all know.a large vocabulary contributes tobreaking down barriers to reading.You are also expected to take any opportunity to communicate with others inChinese.In addition,it is also a must for you to have a good knowledge of Chinese culture and history.I hopethat my suggestions could be of some help to you.Best wishes！Yours.Li Hua