【单选题】听力原文:W: What's wrong with you? You look so frustrated. Is it about your new job? M: Well, I have nothing to complain about this new job. Flexible working hours, less stressful and well-paid the only t...
【简答题】During the years after the terrorist attack on the World Trade Center, structural engineers have been trying hard to solve a question that would otherwise have been completely unthinkable: Can buildin...