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.

67.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.
68. 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.
69. 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.
70. 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

E
Throughout the history of the arts, the nature of creativity has remained constant to artists. No matter what objects they select, artists are to bring forth new forces and forms that cause change-to find poetry where no one has ever seen or experienced it before.
Landscape(风景) is another unchanging element of art. It can be found from ancient times through the 17th-century Dutch painters to the 19th-century romanticists and impressionists. In the 1970s Alfred Leslie, one of the new American realists, continued this practice. Leslie sought out the same place where Thomas Cole, a romanticist, had produced paintings of the same scene a century and a half before. Unlike Cole who insists on a feeling of loneliness and the idea of finding peace in nature, Leslie paints what he actually sees. In his paintings, there is no particular change in emotion, and he includes ordinary things like the highway in the background. He also takes advantage of the latest developments of color photography(摄影术) to help both the eye and the memory when he improves his painting back in his workroom.
Besides, all art begs the age-old question: What is real? Each generation of artists has shown their understanding of reality in one form or another. The impressionists saw reality in brief emotional effects, the realists in everyday subjects and in forest scenes, and the Cro-Magnon cave people in their naturalistic drawings of the animals in the ancient forests. To sum up, understanding reality is a necessary struggle for artists of all periods.
Over thousands of years the function of the arts has remained relatively constant. Past or present, Eastern or Western, the arts are a basic part of our immediate experience. Many and different are the faces of art, and together they express the basic need and hope of human beings.
71. The underlined word “poetry” most probably means　　.
A. an object for artistic creation
B. a　collection of poems
C. an unusual quality
D. a natural scene
72. Leslie's paintings are extraordinary because     .
A. they are close in style to works in ancient times
B. they look like works by 19th-century painters
C. they draw attention to common things in life
D. they depend heavily on color photography
73. What is the author's opinion of artistic reality?
A. It will not be found in future works of art.
B. It does not have a long-lasting standard.
C. It is expressed in a fixed artistic form.
D. It is lacking in modern works of art.
74. What does the author suggest about the arts in the last paragraph?
A. They express people's curiosity about the past.
B. They make people interested in everyday experience.
C. They are considered important for variety in form.
D. They are regarded as a mirror of the human situation.
75. Which of the following is the main topic of the passage?
A. History of the arts.
B. Basic questions of the arts.
C. New developments in the arts.
D. Use of modern technology in the arts.