OPEC holds meetings frequently so as to regulate the outp of __ oil.A.firstB.crudeC.originalD.primary
OPEC holds meetings frequently so as to regulate the outp of __ oil.
A.first
B.crude
C.original
D.primary
B.crude
C.original
D.primary
参考解析
解析：A选项意为“第一的，基本的”；B选项意为“天然的，未加工的”；C选项意为“原始的，最初的”；D选项意为“初级的，基本的”。题目意为“石油输出国家组织（OPEC）经常召开会议，以控制___油产量。”crude oil为固定搭配，意为“原油”。因此选B，控制原油产量。
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