试题题干
Fill in the blanks with one of the items given below:
To mine a single ounce of gold—the amount in a typical
ring—the removal of more than 250 tons of rock.
参考答案
正确答案：![]()
Fill in the blanks with one of the items given below:
To mine a single ounce of gold—the amount in a typicalring—the removal of more than 250 tons of rock.