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
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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