____元
美国人约翰的度假屋距离北美五大湖中的安大略湖岸约8米远，3月初的一场寒冷风暴侵袭了他的度假屋，将这里的一切都冻成了“冰雕”。据此完成下列各题
根据对话内容，从方框内的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。Mrs. Lee: Hello. 68178502.David: Hello.____ ?Mrs. Lee: Sorry.____ . Can I take a message?David: Yes. This is David, Bruce’s friend. I want to ask him for some Chinese ancient coins. He told me he had got some recently. ____ . I don’t care if they were made of different metals. I just want to add some more coins in my collection.Mrs. Lee: OK. I’ll tell him. Would you like him to ring you back later?David: Well, I won’t be at home later this day. Would you please ask him to ring me tomorrow morning?Mrs. Lee: Sure.____ ?David: Oh, sorry.____ The new number is 66129853.Mrs. Lee: OK. I’ll write a message for him.David: It’s really nice of you, Madam. Thank you very much. Goodbye!Mrs. Lee: Bye!
依次填入下列各句横线处的成语，最恰当的一组是（ ）
①对于深陷危机的巴西足球队，外界唱衰的论调尤甚。巴西人能让这些担忧随着奥运的开幕 吗？
②岁月变迁，曾经在上海街头风光一时的老艺人们 ，经历着各自不同的命运。
③由于森林不断退化和消失，至上世纪90年代末，东北虎在中国境内基本 。
设l、m是两条不同的直线，α、β是两个不同的平面，给出下列5个命题：①若m⊥α,l⊥m，则 l∥α；②若m⊥α,l⊂β，l∥m，则α⊥β；③若 α∥β，l⊥α，m∥β，则l⊥m；④若 α∥β，l∥α，m⊂β，则l∥m；⑤若α⊥β，α∩β=l，m⊥l，则m⊥β．其中正确命题的个数是( )
