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【简答题】
原核生物DNA转录时，识别启动子的因子是 A. IF - 1 B．RF - 1 C．σ因子 D．ρ因子
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【简答题】Bambi Mother? I ____ you so much. Sh... there there. It’s going to be all right. You’ll see. Why did you have to go? Everything in the ______ has its season. Where one thing falls, another ______. May...
【单选题】Passage Three Questions 18 to 20 are based on the passage you have just heard. Why did man have to track his target at a close range when using a short bow?
A.
Because it was too heavy.
B.
Because it did not bend easily.
C.
Because it did not shoot far.
D.
Because its string was short.
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