Here are the classifications for each example:
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Some believe teens should never drink high-fructose juices; others think it is fine. - Persuasion
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Those who drink high-fructose juices as teens face frightening health risks later in life. - Argument
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Ducks are terrible pets because they can make owners miserable. - Argument
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Although ducks are not for everyone, many people find them interesting and fun pets. - Persuasion