阅读下列材料,回答问题。
材料一 国际斗争永远都是这样……昨日还是坚定的盟友……现在却完全恢复老样子……利益的冲突导致了同盟国之间迅速变脸,演化出了冷战。
——《世界上下五千年》
材料二 1950年,冷战的焦点从欧洲转移到远东。这时,东方与西方(两大阵营)在欧洲已成均势。但是,当朝鲜爆发战争、冷战变为热战时,在远东形成均势的希望破灭了。
——摘编自《全球通史》
一元二次方程x2﹣6x+8=0的根的情况是( )
Hello! I' m John. I usually have a busy but happy weekend. I usually do my home- work first. Then I visit my grandparents on Saturday afternoon. They are very happy to see me. On Sundays I often play football with my friends. Sometimes I go swimming or go shopping. But I can't go out this weekend, because the weather report says it's going to rain. I can't play football in the rain. I can only play the piano at home. This is my weekend. What about you?
—What were they doing from 8:00 to 10:00 p.m. last night?
—They ____ (use) the Internet.