题目内容
More than ________ years ago. cotton was brought into China by camel caravan trund.
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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.
A camel eat around __________ kilograms of food in one day.
At National holiday time There can be up to _______ people visiting Dunhuang Everyday.
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