A. plants are important for life

　　    B. plants cannot grow without air

　　    C. there are many plants in the world

　　    D. we can not live without water

　　  57. Plants can make food from______.

　　    A. flower, water and air   

　　B. water，sunlight and air

　　    C. air，water and soil   

　　D. air，sun and light

　　   What can we infer（推断） from the passage ？

　　    A. Of all living things animals are most important

　　    B. Without plants， man will die out

　　    C. All fruits of flowering plants have seeds

　　D. Spores are seeds

　　 This passage may be taken from______.

　　    A. a medicine book   

　　B. a science magazine

　　     C. a novel 

　　D. an experiment report

　　B

　　I suddenly heard an elephant crying as though frightened. Looking down, I immediately recognized that something was wrong, and ran down to the edge of the near bank. There I saw Ma Shwe with her three-month-old calf struggling in the fast-rising water, and it was a life-and-death struggle. Her calf was floating and screaming with fear. Ma Shwe was as near to the far bank as she could get, holding her whole body against the rushing water, and keeping the calf pressed against her huge body. Every now and then the rushing water would sweep the calf away. There was a sudden rise in the water and the calf was washed clean over the mother's body and was gone. Ma Shwe turned quickly to reach it and pressed the calf with her head and trunk(象鼻) against the rocky bank. Then with a huge effort, she picked it up in her trunk and tried until she was able to place it on a narrow shelf of rock.

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