皮皮学，免费搜题
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【单选题】
既可利用上游启动子又可利用下游启动子的RNA聚合酶是?A.
RNA聚合酶Ⅰ
B.
RNA聚合酶Ⅱ
C.
RNA聚合酶Ⅲ
D.
RNA聚合酶Ⅳ
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】After a long hard training, the athlete decided that he was going to _______the existing world record set by someone else.
A.
challenge
B.
spoil
C.
distinguish
D.
achieve
【单选题】After months of hard training, Jim is now well on the way to ____ his pilot's license.
A.
maintaining
B.
maintain
C.
attaining
D.
attain
【简答题】Their bodies were hard and m________ after much training.
【简答题】简述项目管理的知识体系包括哪些?
【单选题】After hard training for a long time, Liu Xiang ______ the records again. [ ]
A.
broke
B.
achieved
C.
invented
D.
completed
【单选题】After months of hard training, Jim is now well on the way to ___________his pilot's license. (Para. 5)
A.
maintaining
B.
maintain
C.
attaining
D.
attain
【单选题】After hard training for a long time, Lucy the records again.
A.
broke
B.
achieved
C.
invented
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