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【单选题】
健美操的基本动作是健美操运动的基础和（）。A.
保障
B.
前提
C.
核心
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举一反三
【单选题】Great Changes have taken place since then in the factory we are working.
A.
where
B.
that
C.
there
D.
which
【单选题】Great changes ahve taken place since then in the factory we are working.
A.
where
B.
that
C.
which
D.
there
【单选题】Because of the recent fire in the factory, all the stocks were destroyed. (), we cannot make shipment as arranged before.
A.
In the case
B.
In this cases
C.
In this event
D.
At this event
【单选题】The river by waste products from the factory. We can find no fish in it.
A.
has polluted
B.
will pollute
C.
has been polluted
D.
will be polluted
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