题干

图甲是利用人工湿地净化生活污水(主要含有机物)的原理简图.科研人员为有效控制该湿地生态系统中的某种害虫,引入了该害虫的天敌,并用一段时间的调查数据构建了图乙所示的模型(图乙中箭头方向代表曲线变化趋势).请据图回答:

(1)②输入该人工湿地的能量有____ 、____ .

(2)芦苇属于挺水植物,绿筷属于浮游植物,黑藻属于沉水植物,这一现象体现了群落具有____ 结构.

(3)检测表明,出水口中无机污染物和有机污染物的含量都大大降低,在该过程中起主要作用的生态系统成分是____ 和____.

(4)图乙模型属于____ (“物理”或“概念”或“数学”)模型,其曲线变化趋势反映了生态系统中普遍存在____调节.仅从该模型分析,图中最可能代表天敌K值的数据为____ .

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答案(点此获取答案解析)

光能,(污水)有机物中的化学能,垂直,生产者,分解者(前后顺序可调换),数学,负反馈,P2

同类题4

阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。

    UN Chinese Language Day ____ (celebrate) yearly on April 20. This year, Doreen Hynd was among those invitees, who are either experts on the Chinese culture ____ have a special skill related to it.

    Hynd astonished all those present while performing Tai Chi, ____ Chinese martial (武术的) art form, at an event held by the UN Tai Chi Club. The audience could hardly believe she was a 93-year-old grandma. It was definitely amazing that she could bend her body and raise her leg so ____ (easy) and keep herself still standing on one leg.

    Hynd owes (归功于) all this to her continuous practice of Tai Chi.

    Born in Australia in 1925, Hynd began Tai Chi training in her 50s and then moved to the US, ____ she later became an instructor herself.

    When ____ (ask) about the greatest benefit she gained from Tai Chi, Hynd said, “balance.” Hynd has been teaching people of all ages and different ____ (culture) backgrounds how to practice Tai Chi. They have benefited greatly from their association with the Chinese culture. They've developed a balanced state of mind and improved their health after ____(month)of practice. Tai Chi allows these people ____(understand)that, from the perspective(视角)of yin and yang, all things are closely connected with each other. This might be where the attraction of Tai Chi ____(lie). Hynd enjoys sharing this great gift from China with her students.