题目内容
The_____at the highest point in the United States is 20,000 feet at Mt McKinley in Alaska.
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The period of adolescence may be long or short, depending on social _____ and on society’s definition as to what constitutes maturity and adulthood.
The book proved to be very unreliable and so was quite _____ to him in his research.
His career was not noticeably _____by the fact that he had never been to college.
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