The solar­powered irrigation systems produced an average of nearly two tons of vegetables per month.During the first year，the women kept a monthly average of almost nine kilograms of vegetables for home use.They sold the surplus produce at local markets.The earnings greatly increased their ability to buy food during the dry season which can last six to nine months.People in the two villages with the systems were able to eat three to five more servings of vegetables per day.But making the surplus available at markets also had a wider effect.

　　The study compared the villages with two others where women farmed with traditional methods like carrying water in buckets.The amount of vegetables eaten in those villages also increased，though not as much.The researchers note that only four percent of the cropland in Sub­Saharan Africa is irrigated.Using solar power to pump water has higher costs at first.But the study says it can be more economical in the long term than using fuels like gasoline，diesel or kerosene.And solar power is environmentally friendly.

　　66．Food security in Sub­Saharan Africa is insufficient mainly because of________.

　　A．lack of rainfall

　　B．limitation of farmland

　　C．a small crop variety

　　D．little sunlight

　　67．From the third paragraph we know that________.

　　A．water is wasted by using the system

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