2、There are no dancers that aren’t slim and no singers that aren't dancers. Therefore, all singers are slim.
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3. A toothpick (牙签) is useful. Useful things are valuable. Therefore, a toothpick is valuable.
A. 对
B. 错
4. Three pencils cost the same as two erasers. Four erasers cost the same as one ruler. Therefore, pencils are more expensive than rulers.
A. 对
B. 错
5. 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.
A. 对
B. 错
6. A fruit basket contains more apples than lemons. There are more lemons in the basket than oranges. Therefore, the basket contains more apples than oranges.
A. 对
B. 错