题目内容
There are no dancers that aren't slim and no singers that aren't dancers. Therefore, all singers are slim.
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A toothpick is useful. Useful things are valuable. Therefore, a toothpick is valuable.
Three pencils cost the same as two erasers. Four erasers cost the same as one ruler. Therefore, pencils are more expensive than rulers.
Class A has a higher enrollment than Class B. Class C has a lower enrollment than Class B. Therefore, Class A has a lower enrollment than Class C.
金属材料的断后伸长率和断裂收缩率越大，塑性就越差。
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