7.The African elephant,which is the largest land animal remaining on earth,is of great importance to African ecosystem.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 300pounds of plants it must have every day,it kills small trees and under-bushes,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.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 become 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 become 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.

8.What is the passage mainly about?B
A.Disappearance of African elephants.
B.The effect of African elephants'search for food.
C.Forests and savannas as habitats for African elephants.
D.The eating habit of African elephants.
9.What does the underlined phrase"setting the terms"most probably mean?B
A.Fixing the time.B.Deciding the conditions.
C.Improving the quality.D.Worsening the state.
10.What do we know about the open spaces in the passage?C
A.They result from the destruction of rain forests.
B.They provide food mainly for African elephants.
C.They are attractive to plant-eating animals of different kinds.
D.They are home to many endangered animals.
11.The passage is developed mainly byD
A.giving examples
B.pointing out similarities and differences
C.describing the changes in space order
D.showing the effect and then explaining the causes.

分析 本文主要講述的就是在非洲草原的生物鏈中大象的重要作用,它不斷的尋找食物拓寬了其它動(dòng)物的生存空間等.

解答 8.B 主旨大意題.本文主要講述的就是在非洲草原的生物鏈中大象的重要作用,它不斷的尋找食物拓寬了其它動(dòng)物的生存空間等.故B正確.
9.B 推理判斷題.根據(jù)文章3,4,5行As a big planteater,it largely shapes the forestandsavanna (稀樹草原) surroundings in which it lives,therefore setting the terms of existence for millions of other animals that live in its habitat.說(shuō)明非洲大象塑造了草原的環(huán)境,也決定了其它的動(dòng)物的生存的條件.故B正確.
10.C 細(xì)節(jié)理解題.根據(jù)文章9,10,11行This results in numerous open spaces in both deep tropical forests and in the woodlands that cover part of the African savannas.In these open spaces are numerous plants in various stages of growth that attract a variety of other planteaters.說(shuō)明開(kāi)放的空間對(duì)于其它的食草動(dòng)物也很重要.故C正確.
11.D 推理判斷題.本文主要通過(guò)描述大象的行為帶來(lái)的具體的影響以及對(duì)這些影響的原因的解釋.故D正確.

點(diǎn)評(píng) 本文是一篇科教類閱讀,題目涉及多道主旨大意題,細(xì)節(jié)理解題,推理判斷題.做題時(shí)學(xué)生應(yīng)仔細(xì)閱讀原文,把握文章主要內(nèi)容,聯(lián)系文章上下文內(nèi)容并結(jié)合所給選項(xiàng)含義,從中選出正確答案,一定要做到有理有據(jù),切忌胡亂猜測(cè).

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