单项选择题

Prometheus stole ______for mankind in open defiance to the decrees of Zeus, and was chained to the cliffs of Caucasus Mountains and exposed to horrible tortures.
A、food
B、
fire
C、
water
D、seeds

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若要找出在关系R的A属性上不为空的元组，则选择子句WHERE后应表达为（ ）。 A、A ; NULL B、A ; ' ' C、A IS NOT NULL D、A NOT IS NULL
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The Puritans’ elaborate style showed in their writing, which employed elevated language and often focused on secular life. （ ）
A．对
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