单项选择题

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

A. one of
B. older
C. established
D. by Congress

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单项选择题
The physician considers going to bed early to be more sensible ______ late.
A. but staying up
B. than to stay up
C. for staying up
D. than staying up
单项选择题
The book was（）that I returned it to the library without finishing it

A. so bored
B. returned it
C. to the library
D. without finishing
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