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【单选题】
{}至今为止,在人类发展的历史中,曾经历过( )次信息技术革命。
A.
B.
2
C.
D.
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A.
might
B.
could
C.
should
D.
would
【多选题】不属于母子关系的是( )
A.
木和水
B.
水与土
C.
火与土
D.
 木与金
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【多选题】不属于母子关系的是()
A.
木和水
B.
水与土
C.
火与土
D.
木与金
E.
金与水
【单选题】下列不属于母子关系的是
A.
木和火
B.
火和土
C.
水和木
D.
木和金
E.
土和金
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