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A．producedB．was producedC．producingD．had been
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A．have beenB．would have beenC．could have beenD．should have
A．to wonderingB．to be wonderingC．wonderD．wondering
According to this introduction, the best way to use this book is______.
Darwin is basically right, though only to some extent that species and individuals compete, fight, kill and survival belongs to the fittest. This is one of the most important mechanisms by which life evolves and maintains its quality. As the human society builds upon and is an extension of the ecosystem, does it mean that for the human society to work well, man must apply this mechanism to her/his society also; say, let those who are not skillful enough to land a job starve to death？
We may be enlightened with respect to this question through the examination of evolution in an ecosystem in comparison to the human history. Taking the maritime swamp land as an example, the mangrove species Kandelia candle competes successfully over other mangrove species and dominate the area chiefly through the evolution of droppers that other species do not have. The seeds of Kandelia candle grow into seedlings inside the droppers before leaving their mother plant body and when the droppers still hang on the branches of their mother plant. The dropper's shape is like a pen, with a sharp and heavier lower end. So when it ripens, it drops and inserts itself together with the seedling into the mud below as a result, and the seedling can get hold of the ground, start to tap the much fresher water under the mud surface. This adaptive evolution of droppers enables Kandelia candle to have a much greater successful rate. Seeds of other mangrove species just find it difficult to locate a suitable site for them to grow.
When it is the industrial society that dominates a place, it always exploits resources from the land, drains out nutrients from the soil and plays environmental havoc to the place as a result of stupid human intelligence and selfish human manipulation. But when the mangrove dominates a mudflat, millions of Nature evolved complex mechanisms come together with it. It taps water, minerals from the mud and then let them to combine with carbon dioxide in the air to form. the building materials of its plant body first through the process of photosynthesis and then through the synthesis of various organic matters. The effect ends up providing much better and more diverse living environment for more land, water and air species to dwell in, even for other competing mangrove species.
When different races of man compete to dominate the earth, the end result is completely opposite in sense. One of the means they evolve are more and more powerful weapons, some, of the human races also evolve droppers, but those droppers are droppers of nuclear bombs, which are all life destructive when used.
Animals never burn up a forest, or practice fighting skills twelve hours a day in order to defeat their competitors; they just let Nature cut out the weaker or less fortunate portion of their species, or that their species simply cannot survive in the first place. On the contrary, man can work round the clock, and exhaust all natural resources just to defeat their enemies, whether military or commercial, as we can all see in our modern societies. Such practice' generates quite grave problems: First, it pushes human activities into a very narrow goal of defeating their enemies militarily as well as economically. Second, all the available time, energy and resources of an individual as well as the society are exhausted by the competition, very little is left to other activities, so nearly all men suffer very much in the process and countless new problems besiege modern societies. Third, as all participants input as much time, energy and resources as can be exploited by them, most of these inputs are wasted. Such effort creates a lot of waste and exhausts all resources as a result.
We should also view how man should conform. to Nature in such a way that man has to compete for survival. In fact this is Nature's way of telling man how to act. If only man could listen to this internal guidance, b
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