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【多选题】
δ因子的功能有哪些?A.
保证转录的正确启动
B.
保证转录以不对称转录的方式进行
C.
保证转录的准确性和特异性
D.
促进RNA pol与启动子的紧密结合
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举一反三
【简答题】In the 17th century letters were carried from Britain to European countries by sailing______.
【简答题】“天苍苍，野茫茫，风吹草低见牛羊”描述的是哪个地区? ()
【单选题】Newspaper is one of ______ means of sending news and information.
A.
common
B.
more common
C.
the commonest
D.
the most common
【简答题】“天苍苍，野茫茫，风吹草低见牛羊”的景观描写的是哪里?
【简答题】“天苍苍，野茫茫，风吹草低见牛羊”描述的景观位于我国哪个高原?
【单选题】Many farmers in rich countries moved to cities in the 19th century because of ______ .
A.
a scarcity of farm jobs
B.
the hope of better jobs and life
C.
discriminating economic policies
D.
both A and B
【简答题】“天苍苍，野茫茫，风吹草低见牛羊”的景观是指内蒙古高原。 ( )
【单选题】Sending man into ______ space is not _____dream for human beings any longer.
A.
/; a
B.
the; a
C.
the; the
D.
/; the
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