单项选择题

The （） of the Mississippi River is located more than two hundred miles from its mouth.

A.source
B.beginning
C.resource
D.origin

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（）are interested in children's life.

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B.Women writers
C.Women writer
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No sooner had we sat down （） we found it was time to go.

A.than
B.when
C.as
D.while
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