is called evergreen agriculture.This is where farmers plant trees with their crops.Farmers in Africa have been doing this for sixty years，but it seems to be growing in popularity.

　　The method is gaining widespread use in countries such as Niger，Burkina Faso，Malawi and Zambia.The trees are planted among maize (玉米)，millet or sorghum crops.They not only add nitrogen (氮) to the soil through their roots，but also through their leaves when they fall off and break down.At other times of the year，the trees can protect plants from strong sunlight.

　　John Reganold says he knows of one woman who has had great success with perenniation.

　　“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.”

　　1．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

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

　　A．Being exposed to wind and rain.

　　B．Growing different crops.

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