What is the talk mainly about A: The gold mining operations among the Native Americans. B: The gold-mining frenzies in Georgia and California. C: The westward movement across the United States. D: The mistreatment of the Native Americans in Georgia.

In the southwestern part of the United States _________ built in the last century. A: they are many abandoned mining towns B: where there are many abandoned mining towns C: are many abandoned mining towns D: many abandoned mining towns are

In the southwestern part of the United States ______ built in the last century. A: there are many abandoned mining towns B: were many abandoned mining towns C: where there are many abandoned mining towns D: where are many abandoned mining towns

Data Mining：

he main production links of open-pit mining production technology include rock preparation, mining and loading, transportation and .

In mining industry, “black diamonds” are （ ）.

The level with is called the mining level.

Which of the following is not a basic procedure for text mining? A: Text preprocessing B: Text classification C: Text transformation D: Text mining

In “Nothing gold can stay”, what are the symbolic meanings of “gold”?

序列s =["seashell","gold","pink","brown","purple","tomato"],则print(s[1:4:2])结果为 A: ["gold","pink","brown","purple","tomato"] B: ["gold","pink"] C: ["gold","brown"] D: ["gold","pink","brown"]