一个长方体教具，棱长之和是60厘米，如果它的长是8厘米，宽是5厘米，高应是（    ）厘米。

注： $P\left(\mu -\sigma <\xi <\mu +\sigma \right)=68.26\%$ ， $P\left(\mu -2\sigma <\xi <\mu +2\sigma \right)=95.44\%$ .

                                                                                                 海鸥与巷燕
      鸥于海渚遇巷燕。
      燕谓鸥曰：“我至子所，而子不至我所，何也?”曰：“吾性傲以野，不乐依人焉，故也。”
      燕曰：“我以依人而处，故飙风得所障，冻雨得所蔽，炽日得所护。以是观之，子其病^①矣。”鸥曰：“吾病而有不病者存，不若子之昧于病而未见也。”
      燕曰：“我之得以依人者，以人不之憎且爱之也。子之病我者，忮^②其爱乎?”鸥曰：“子谓人之于我，爱乎，憎乎?”燕曰：“皆无之。”鸥曰：    “吾以傲野自适，人之憎爱非所论也。即以人论，吾以不见^③爱，故不见憎。然则，见爱者其危哉!”
      燕不喻而去。其后，巷人方食，燕泥污其羹。因怒而逐之，燕于是始思鸥言。

                                                                                                                                                                     (选自刘熙载《寤崖子》)
     【注】①病：困苦。②忮(zhì)：嫉妒。③见：表示被动，相当于“被”。

①Cr₂O₃固体既能溶于KOH溶液得到KCrO₂溶液，又能溶于硫酸得到Cr₂（SO₄）₃溶液；

②向KCrO₂溶液中滴加H₂O₂溶液，再酸化，可得K₂Cr₂O₇溶液；

③将K₂Cr₂O₇溶液滴加到淀粉和KI的混合溶液中，溶液变蓝．

下列判断不正确的是（   ）

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。

    Want to be happy and enjoy your life? Here are four ways to bring you happiness.

● Share appreciation

    Tell someone how much you appreciate（欣赏）them. Thank them sincerely for being part of your life. ____. When you share with someone your appreciation, they will not forget you.

●____

    One of the best ways to strengthen new ideas in your mind is to share them with others. The more often you share what you've learned, the stronger that information will become in your memory. Sharing knowledge also provides solutions to problems. The more knowledge we share, the more knowledge we receive in return.

● Share friendship

    Let your friends know that you are willing to be there when they need you. Introduce two friends who don't know each other. ____.

● Share experience

    Keep written or photo journals of your life. ____. Share a happy memory. Also share the difficult times that have helped you become stronger and wiser. When shared, the value of these experiences multiplies.

    ____. We make a living by what we get, but we make a life by what we give.

 A. Share knowledge and ideas.

 B. Record successes and failures.

 C. We succeed with the help of others.

 D. Happiness is not so much in having as sharing.

 E. You can spend time with the people that you love.

 F. Feeling appreciated is one of the most important needs that people have.

 G. If you'd like to have many friends, share friendship with others generously.