单项选择题
When the
concentration
of calcium in the blood is
too
low, the parathyroid glands
began
to
secrete
the hormone parathormone.
A．concentration
B．too
C．began
D．secrete
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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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