听小对话,选图画,回答问题。 1. What are they talking about? [ ] A. B. C. 2. How will they spend their weekend? [ ] A. B. C. 3. Where is the speaker now? [ ] A. B. C. 4. Which is Betty's pet? [ ] A. B. C. 5. What sign can they see? [ ] A. B. C.
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【单选题】某平面图形有两个投影为类似形,则该平面可能是 ____ 。 I .平行面; II .垂直; III .一般位置面。