“She’s a grandmother in her fifties.Her name is Rhoda Mang’yana and she started using this system about twenty years ago.And her yields initially were about a ton of maize.Now with a good year she gets four tons per hectare，four times what she was getting.”

　　6．The purpose of the passage is to________.

　　A．tell people how to increase production

　　B．introduce an agricultural system in Africa

　　C．introduce the oldest farming method in Africa

　　D．tell us how to prevent soil being poor

　　7．What does the underlined word “weathering” in Paragraph 4 most probably mean?

　　A．Being exposed to wind and rain.

　　B．Growing different crops.

　　C．Being polluted severely.

　　D．Being ploughed improperly.

　　8．According to the passage，which of the following statements is WRONG?

　　A．Perenniation mixes food crops with trees and perennial plants.

　　B．Poor soil is the main problem in increasing food production.

　　C．Farmers may be more to blame for the present situation.

　　D．American researchers first invented perenniation.

　　9．Evergreen agriculture is popular with the farmers mainly because it________.

　　A．can build the soil and improve the yield

　　B．can provide more wood as well

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