题目内容
The trading route of the silk road began ever since Han dynasty of ______ years ago.
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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.
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.
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