运用所学知识回答下列问题．

Welcome to the Kids' Science Challenge!

    Do you like science projects and winning some awesome gifts? This is the challenge for you. What's even better is that you don't have to build anything--simply come up with an original idea or design that relates to one of three topics given below.

Wonderful Sounds

    Ready for Wonderful Sounds? Click on Science Secrets to meet our sound specialist. And be sure to download fun activities with crazy new sounds and musical instruments in the Dig In section! Now what kind of new musical instrument can you invent?

Super Material for Sports

    Ready for Super Material for Sports? You'll discover the amazing world of Materials Science, where scientists and engineers develop new materials for everyday functions--like sports! Click on Science Secrets for information about our scientist. And don't forget to download the fun activities in the Dig In section! Now can you come up with a new sports material that would help you play your favorite sport?

Magical Microbes

    Ready to discover Magical Microbes, the tiniest living things on earth? Click on Science Secrets for information about our scientists. And be sure to download all the fun activities in the Dig In section! Now can you think of a brand new way that microbes can help people?

排列句子。

____湖当中，水面平静得像一面镜子，绿得像一块碧玉。几只游船正在上面慢慢滑过，几乎不留一点痕迹。

____湖岸边，垂柳成行，知了叫个不停。一阵微风从湖面上吹来，好凉爽啊！

____青龙湖的景色可真美啊！

____星期天，爸爸带我到青龙湖去玩。

____在湖边的浅水里，十几个孩子正在游泳、嬉戏、打闹，玩得真开心。

1951年5月23日，中央人民政府和西周地方政府在北京中南海正式签订了《关于和平解放西藏办法的协议》。这意味着中央人民政府（    ）

某学生用两个相同的热源分别对质量为m₁，比热为c₁的甲物质和质量为m₂、比热为c₂的乙物质加热，并根据实验测得的数据分别画出甲、乙两物质的温度随加热时间变化的图线，如图10所示。根据图线情况，作出如下推断，其中错误的是(  )