算一算，比一比．

    

某学生为了验证铁、锌、铜三种金属的活动性顺序，设计了四种方案：①将Zn、Cu分别加入到FeSO₄溶液中，②将Zn、Cu分别加入到ZnSO₄溶液中，③将Zn分别加入到FeSO₄、CuSO₄溶液中，④将Fe 分别加入到ZnSO₄、CuSO₄溶液中。其中正确的方案是（　　）

完形填空
    When I spent the summer with my grandmother, she sent me down to the 1with a list, I walked up to the counter．Behind it was an old lady named Miss Bee.
    “Excuse me，”I said. She 2“I need to get these，”I continued, 3up my list.
    “So? Go get them，”Miss Bee said.“4is here except you and me, and I'm not your servant. I suggest you get yourself a basket over there and start5.”It was not 6for a 7­ year ­old child, there were so many different kinds of things. I spent over an hour in the store.
I visited Miss Bee twice a week that summer. She 7short­changed me. Other times she overcharged. Going to the store was like going into a war. But by the end of that summer, I could finish my shopping trip8around 15 minutes. The morning I was to return home, I stopped in the store again to buy something.
    “All right，”Miss Bee said. “What did you 9this summer？”
    “That you're mean！”I replied.
    Miss Bee just laughed，“ I know 10you think of me，”she said. “Well, I don't care! My job is to teach every child I meet some life 11. When you get older you'll be glad that you met me！”Glad I met Miss Bee? Ha！How could it be?
    It sounded funny until one day my son came to me with his homework. “It's too 12 ． ”he said. “Could you finish the math problem for me？”
    “13I do it for you, how will you ever learn to do it  yourself？”I said. Suddenly, I was back in that store where I had learned to add up my bill by myself. Had I ever been overcharged since?
    Life is full of all kinds of 14. We may be 15 a hand once or twice, but luck may not find us every time. So we should work them out by ourselves.

合理的饮食有利于青少年的健康成长。以下对健康有利的饮食方式是（     ）

阅读下文，回答相关问题
在厄运和不幸面前
①鲁迅先生曾说过："伟大的胸怀，应该表现出这样的气概--－用笑脸迎接悲惨的厄运，用百倍的勇气来应付一切不幸。"
②是的，生活没有一帆风顺的。处处有荆棘，时时有坎坷。一帆风顺的生活只是庸人想象的"理想方案"。当厄运和不幸降临时，不要逃避，逃避只是怯懦者对待生活的"法宝"。是勇士就应当勇于直面人生，"用笑脸迎接悲惨的厄运，用百倍的勇气来应付一切不幸"。
③敢于直面厄运和不幸，正是鲁迅先生一生的写照。小时候，奔跑于当铺和药铺之间，用典当得到的钱给生病的父亲买药治病，这种生活不能说不是清苦的。然而在这样的环境中，他并没有消沉，而是勇敢地迎接命运的挑战。从某种意义上说，正是厄运和不幸造就了这位文学大师。
④厄运和不幸对于怯懦者是毁灭的深渊，对于生活的强者，却是他们成功的阶梯，是他们一生中的财富。
⑤培根说过：“奇迹多是从厄运中出现的”。贝多芬有耳疾，他却在听力尽失的情况下完成了具有划时代意义的第三交响曲--《英雄交响曲》。爱迪生耳聋而成为举世闻名的“发明大王”。张海迪高位截瘫，生活不能自理，可以说是不幸的。可她又是一般人无法与其相比的。她以百倍的自信，顽强的毅力和对美好生活的向往与追求，“站”了起来……
⑥厄运和不幸的降临，并不意味着一事无成。造成一事无成的原因在于自己缺少自信，在厄运面前退缩了。
⑦逆境能够扼杀人才，但更多的是造就人才。"逆境是达到真理的一条通路"。从某种意义上说，厄运和不幸也是我们所需要的。生活太顺利了，也是一种遗憾。
⑧当厄运和不幸降临时，我们不要害怕。毕竟生活不是梦，而是由我们自己托起的一片晴空。