未知题型 主要用于桥梁、建筑等钢结构制作中的金属材料是（ ）。

未知题型 听力原文： (27[B]) World marathon record holder Paula Radcliffe has decided to fun at 34 in the 2008 Olympic Games in Beijing Athens disappointment. (26[C]) The Briton failed to finish in either the marathon or 10,000m in last August's Games in Athens. 'It was never a case of if I get what I want in Athens I will back off,' Radcliffe told the Dally Mail. 'I always wanted another Games. I hope to make 2012 too, maybe not at the same revel but I hope to make the team.' (28[A]) She said the misery of Athens offered her a new incentive. 'Underneath it all, it has made me more determined to come back and show what I can do,' she said. Radcliffe has no object on her schedule for the rest of the year and will probably make herself away from race till next April's London marathon.What was Paula Radcliff's performance like in Athens?A．It was a success.B．She failed one event in Athens.C．It was a failure.D．She had a new world record there.

单项选择题 用访谈法收集资料的过程实际是调查者与被调查者相互交流的过程,访谈的成败取决于交流是否成功,为了能顺利地进行交流,以获得需要的资料,调查者应注意( )。①在访谈之前,调查者应该熟悉和掌握所要问及的问题,并对被访问者的身份、与该问题的厉害关系有尽量深入的了解②在访谈过程中,要尽量保持活跃的气氛,又不能脱离所要了解的中心问题③调查者应该对所问问题持中立态度,不能作引导性提问④对不清楚的关键问题要追问⑤应该随时注意被调查者的情绪、态度的变化