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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You should (check) the air in the (tires) (as) you (start on) a long automobile trip.
A. check
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(However good) (are my paintings), I am (conscious) that they may (leave) much to be desired.
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C. conscious
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