Question

4．The African elephant，the largest land animal remaining on earth，is of great importance to African ecosystem（生態(tài)系統(tǒng)）．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 termsof 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．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．

29．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．
30．What does the underlined phrase"setting the terms"most probably mean？C
A．Worsening the state．
B．Improving the quality．
C．Deciding the conditions．
D．Fixing the time．
31．What do we know about the open spaces in the passage？A
A．They are attractive to plant-eating animals of different kinds．
B．They result from the destruction of rain forests．
C．They provide food mainly for African elephants．
D．They are home to many endangered animals．

Answer 1

分析 主要講述的是非洲大象對非洲生態(tài)的影響，如果非洲大象消失，很多其他的動物也會隨之消失，整個生態(tài)系統(tǒng)也隨之發(fā)生變化．

解答 C篇：BCA
29．B 主旨大意題．根據(jù)文章最后一句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．可知如果非洲大象消失，很多其他的動物也會隨之消失，整個生態(tài)系統(tǒng)也隨之發(fā)生變化．再根據(jù)文章2、3段敘述可知本文主要主要講述的是非洲大象對非洲生態(tài)的影響．故B正確．
30． C 猜測詞義題．根據(jù)前兩種句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，非洲大象是大草原環(huán)境的奠基者，它們對草原的環(huán)境起著決定性作用．所以本句therefore setting the terms of existence for millions of other animals that live in its habitat．中的下劃線部分意為C項"Deciding the conditions．"
31．A  推理判斷題．根據(jù)第三段最后兩句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．可知大象把大樹推倒，創(chuàng)造出更多的空地，讓一些適合在空地中生長的植物成長，讓森林適合更多的食草動物生存．故A正確．

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