单项选择题

You should (check) the air in the (tires) (as) you (start on) a long automobile trip.

A. check
B. tires
C. as
D. start
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单项选择题
(Hard) (as) he worked, (but) Mr. Black couldn't keep the shop (properly).
A. Hard
B. as
C. but
D. properly
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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