“朋友是一双手，可以把你从绝望中拉出来；朋友是肩膀，可以让你依靠着哭泣；朋友是巨浪，可以令你热情高涨；朋友是一口井，可以让你放心地倾诉痛苦。”这告诉我们（    ）

①朋友带给我们温暖、支持和力量，让我们感受到生活的美好  ②在人生旅途上，朋友伴我们同行

③友谊照亮我们的生活之路                                                              ④朋友会为我们提供一切需要，满足我们所有的要求

    In May, 1976, Gaynor was a nine-year-old girl and lived in North Wales. One day, on her way home from school, she saw a silver(银色的)object(物体)in a field not far from her home. The object looked like a saucer.
    Gaynor was very scared. She stayed behind the tall grass and watched the door of the strange object open. She saw two aliens wearing silver suits get out. Then they used something to examine(检测)the ground. They were short and had pink eyes. After about thirty minutes, the two aliens went back into the object. Then it took off.
    When Gaynor got home, she told her mother about this unusual experience, but her family decided to keep quiet about it. They didn’t want others to laugh at their daughter.
    However, 18 months later, Gaynor told her story to UFO scientists. They found out that Gaynor told the truth.

先简化、再求值：（x+2y）²﹣（x+y）（3x﹣y）﹣5y²÷2x，其中x=﹣2，y= $\frac{1}{2}$ ．

材料一：“总之，居今日而欲整顿海防，舍变法与用人，别无下乎之方……使天下有志之士无不明于洋务，庶练兵、制器、造船各事可期逐渐精强。”———《中国近代史参考资料》

材料二：

向某无色溶液中加入过量的稀盐酸有沉淀生成，过滤后向滤液中加入过量的纯碱溶液又有沉淀生成，下列溶液中符合此条件的是(　　)

①Ag^＋、Fe^3＋、Na^＋　②Ag^＋、Al^3＋、K^＋　③Ag^＋、Ba^2＋、NO　④SiO、AlO、K^＋　⑤Ag^＋、NH、H^＋　⑥AlO、K^＋、Ba^2＋