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C

The African elephant , the largest land animal remaining on 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(栖息地).

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 chaning and worsening the whole ecosystem .

64. 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 .

65. 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 .

66. What do we know about the open spaces in the passage ?

A. They result from the destruction of rain forests .

B. They provide food mainly for African elephants .

C. They are home to many endangered animals .

D. They are attractive to plant-eating animals of different kinds .

67. 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 examples

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   A. ①③④②⑤         B. ③①⑤④②                C. ①⑤④③②              D. ③②⑤④①

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