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【单选题】
设集合P={1，2，3，4}，Q={x|3≤x＜7，x∈N}，则P∪Q=（ ）A.
?
B.
{3，4}
C.
{1，2，5，6}
D.
{1，2，3，4，5，6}
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A.
Change of ocean chemistry.
B.
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C.
Causes.
D.
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A.
It is brief.
B.
It is personal.
C.
It is given in passing.
D.
It provides more details.
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It is a specific instance.
B.
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C.
It is emotionally appealing.
D.
It is a story or anecdote.
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A.
The method he used for applying paint to a canvas.
B.
The location where he did his work.
C.
The widespread popularity of his style of art.
D.
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