如果一个处于稳定状态的生态系统中的四种生物构成了食物链的关系，某一时间内它们的相对数量关系如图所示．一段时间后发现乙的数量增加，此时甲、丙、丁的数量变化是（　　）

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     The umbrella is a very common object. It keeps the  1  and the sun off the people. Most umbrellas can be folded up(折叠) so it is  2 to carry them.

     However, the umbrella has not always been as 3   as it is now. In the past, it was a symbol of importance. Some African countries still use umbrellas in this   4  . Someone carries an umbrella and walks behind the king or important person.

     Umbrellas are very old. People in different parts of the world began to   5   umbrellas at different times. The Chinese had them more than 3,000 years ago. From there , umbrellas   6   to India and Egypt. In Greece and Rome,   7 wouldn't use them. They believed umbrellas were only for women.

     England was 8  the first country in Europe where common people used umbrellas against rain. The weather there is very  9   and umbrellas are very useful.

     Everybody uses umbrellas today. The next time you  10  one, thinking that for centuries only great men and women used them, you'll feel you are important people, too.

材料一 为了了解我国资源状况，某班综合实践活动小组开展了一次调查，通过查阅图书资料和网上搜索，他们获取如下资料：

材料二 在学校公共场所随地吐痰．随地吐口香糖残渣．随地乱扔食品包装袋；下课了，一些同学吃完瓜子顺便反瓜子皮扔在地上。这严重损害了公共利益。
回答问题：

冯天瑜所著的《中华文化史》对董仲舒学说的评价有这样一段描述，“……董仲舒学说的消极影响也是严重的……我们民族性格中的封闭自我，盲目自足，因循守旧，不思进取等等劣根性，都与之直接相关。”以下哪一学说对上述的影响最大