valuable.
举一反三
- valuable.
- A toothpick (牙签)<br/>is useful. Useful things are valuable. Therefore, a toothpick is<br/>valuable. A: True. B: False. C: Uncertain.
- 下面结论得出的过程是否符合逻辑？ A toothpick (牙签) is useful. Useful things are valuable. Therefore, a toothpick is valuable.
- Graduation gifts are usually very valuable.
- The picture ____________ has disappeared is very valuable.