The African elephant, the largest land animal remaining on the earth, is of great importance to African ecosystem(生态系统). Unlike other animals, the African elephant is to a great extent the builder of its environment. As a big plant-eater, it largely shapes the forest-and-savanna(大草原) surroundings in which it lives, therefore setting the terms of existence for millions of other animals that live in its habitat.
It is the elephant’s great desire for food that makes it a disturber of the environment and an important builder of its habitat. In its continuous search for the 300 pounds of plants it must have every day, it kills small trees and underbushes, and pulls branches off big trees. This results in numerous open spaces in both deep tropical forests and in the woodlands that cover part of the African savannas(热带草原). In these open spaces are numerous plants in various stages of growth that attract a variety of other plant-eaters.
Take the rain forests for example. In their natural state, the spreading branches overhead shut out sunlight and prevent the growth of plants on the forest floor. By pulling down trees and eating plants, elephants make open spaces, allowing new plants to grow on the forest floor. In such situations, the forests bee suitable for large hoofed plant-eaters to move around and for small plant-eaters to get their food as well.
What worries scientists now is that the African elephant has bee an endangered species. If the elephant disappears, scientists say, many other animals will also disappear from vast areas of forest and savanna, greatly changing and worsening the whole ecosystem.
【小题1】What is the passage mainly about? A．Disappearance of African elephants.B．Forests and savannas as habitats for African elephants. C．The effect of African elephants’ search for food. D．The eating habit of African elephants.【小题2】What does the underlined phrase “setting the terms” most probably mean? A．Fixing the time.B．Worsening the state. C．Improving the quality.D．Deciding the conditions.【小题3】According to the passage, which of the following statements is TRUE?A．The African elephant is the largest animal on the earth.B．African elephants have 300 pounds of plants every day, including small trees and underbushes.C．The African elephant is in a way the builder of the environment like other land animals.D．If the African elephant disappears, the whole ecosystem won’t be affected.【小题4】The passage is developed mainly by . A．showing the effect and then explaining the causes B．pointing out similarities and differences C．describing the changes in space order D．giving examplesC
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(答案→)C
解析：文章讲述了非洲大象对生态的影响，并解释了具体的原因。
【小题1】主旨大意题。文章正是讲述了非洲大象对生态的影响。
【小题2】猜测词义题。根据上下文可知大象对生态的影响很大；这里是指大象形成了它所生活的大草原的环境，决定了其它一些生活在栖息地的动物的情况。
【小题3】细节题。根据第二段2,3行. In its continuous search for the 300 pounds of plants it must have every day, it kills small trees and underbushes, and pulls branches off big trees.
【小题4】写作方法。文章采用的写作方法是先说明影响，然后解释了具体的原因。