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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