单项选择题

Yellow Stone National Park is (one) of the (older) parks in the U.S. It (was established) by (Congress) in 1872.

A．one
B．older
C．was established
D．Congress
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A．However good
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C．conscious
D．leave
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(It was) (in the) primary school (where) my teacher introduced (me to) computers.
A．It was
B．in the
C．where
D．me
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