题目

阅读下面短文，从短文后各题所给的四个选项（A, B, C和D）中，选出可以填入空白处的最佳选项。It was quite a bad time for me. I was in low ____ and felt tired physically. Probably ____ this I hadn't shaved (剃须) for a few days. ____ because I had been doing some repairs at my daughter's house, I was _____ quite untidily (邋遢). Boarding the ____ to go home, I saw it was almost ____ so I found a rail (扶手) to rest against.That was when a young woman, sitting with her child, stood up and ____ me her seat. “Wow !” I thought, surprised. Out loud I said8．已知两不同的平面α，β和两条不重合的直线m，n有下列四个命题：①若m∥n，n⊥α则m⊥α．②若m⊥α，m⊥β 则α∥β．③若m⊥α，m∥n，n?β，则α⊥β．④若m∥α，α∩β=n则m∥n．其中真命题的有①②③．