After crude oil is extracted from a well, it is usually piped to a refinery.

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问题 After crude oil is extracted from a well, it is usually piped to a refinery.

选项 A、unrefined
B、toxic
C、transparent
D、turbid

答案A

解析 crude(天然的，未加工的)；unrefined(未提炼的)；toxic(有毒的；中毒的)；transparent(透明的)；turbid(浑浊的)。

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