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    Are you sorry for not traveling during the National Day? If you stay a t home at that time, I think you are very lucky. Why? Because there are too many people everywhere. In many places of interest in China, it's too crowded to do anything.

    It was very crowded in the West Lake on October 1st, 2013. You even couldn't take photos for you or your friends. All what we could see were people. It was reported that there were about 13 people per meter by the lake. My friends told me they could see nothing but many tourists(游客) on the Broken Bridge(断桥). "We couldn't walk if the people in front of us didn't walk," he said. He showed us a photo near the West Lake. In the photo, we hardly found him out, there were too many people.

    So some people give the advice that we should not have the gold week(黄金周) any more. But other people say no about this advice. What's your idea of it? Are you sorry now for not traveling during the gold week? I love staying at home more than traveling next National Day.

阅读下面材料
德国和奥匈为了加强同俄国和法国的对抗，1879年缔结军事同盟条约。1882年，意大利同法国矛盾加剧，参加了这一军事集团，20世纪初，英德之间的矛盾日益加剧，英国协调了它同俄、法之间的关系，先后于1904年和1907年签订了英法协约和英俄协约。
回答：
（1）德国结盟的根本原因是什么？
（2）两大军事集团的名称是什么？他们分别以哪国为主？
（3）两大军事集团形成以后大搞什么活动？带来什么严重后果？

下列各式中，是一元一次不等式的是（　　）