单项选择题
Fossils of
plant
that have
been extinct
for
fifty million years
have been found inlarge deposits of amber
near
the Baltic Se
A．A. plantB. forC.fifty million yearsD.near
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单项选择题
The spontaneity of children's artwork sets it apart from the regulated uniformity ofmuch of what otherwise go on in traditional elementary classrooms.
A．sets
B．apart from
C．much
D．go
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单项选择题
It isestimated that a scientific principle has a life expectancy of approximately a decade before it drastically revised or replaced by newer information.
A．estimated
B．a life expectancy
C．decade
D．it drastically
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