题目内容
Dunhuang now has a base of ______ mu of cotton,which makes it the largest colored cotton testing station and production base for green cotton in China.
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Every mu of the colored cotton people can earn an extra _____ yuan over ordinary white cotton.
More than ________ years ago. cotton was brought into China by camel caravan trund.
Even now cotton makes up ______ percent of crops grown and _____percent of farmers' income is in some way connected to cotton in Dunhuang.
As long as ______ years ago human beings living on the edge of the desert had domesticated the camel.
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