某校化学兴趣小组的同学经查阅资料知道：淀粉在适当温度和酸催化条件下可转变为葡萄糖．为探究淀粉在不同温度下转化为葡萄糖的程度，他们每人都进行了如下两步实验：

步骤1．用一支大试管取一定量淀粉与水混合，再加入适量的稀硫酸，摇匀，加热到一定的温度．实验过程中，各人控制温度不同，加热持续时间相同．

步骤2．然后用两支小试管各取少量大试管内的反应混合物，在其中一支小试管（编号为A）内滴加NaOH溶液至呈强碱性，再滴入4-5滴CuSO₄溶液，并加热至沸；在另一支小试管（编号为B）内滴加2-3滴碘水．观察并记录现象．

阅读下面的文章，回答题目。
                                                                                                                                        年轻的国旗
　　①这是由陈九先生【注】讲述的一个真实的故事。
　　②小镇只有一所大学，不大，但哪个国家的学生都有。中国来的一共五名，巧了，全是女生，名副其实五朵金花。珍妮是她们的头儿。五朵金花同吃住同进出，像一家子出来的。其实本来就是一家子。
　　③学校每年春天搞一次隆重的国际街坊节。在小镇主要街道、广场上，让各国来的师生穿上自己的民族服装载歌载舞，当街展示自己国家的食品和工艺品。到那天，各界名流与方圆多少里的男女老幼都会来凑热闹，在此欢歌笑语，尽情玩乐。
　　④五朵金花耐不住好奇，头天就跑上街看街坊节的准备情况。她们要挑选有利地形，来个穿旗袍炸春卷，外加毛笔字，够中国的吧？几个姑娘这儿走走那儿看看，嘻嘻哈哈，踌躇满志。突然，一个姑娘说，好像，我好像没看到中国国旗。广场上空飘满各色国旗，赤橙黄绿青蓝紫，她们一面面数过，就没中国的，咋回事？
　　⑤姑娘们一下懵了，她们此刻感到国旗对自己竟如此重要。珍妮的脸涨得通红，跟国旗那么红。现在只有一个办法，找校长当面问清楚。找校长？对。珍妮拔腿要走，等等，咱们一块儿去。姑娘们捆成一捆儿，碧草蓝天，斜阳映着她们匆匆的背影。
　　⑥白发苍苍的校长先生面对为何别国的国旗都有，却偏没中国国旗的提问，很显窘迫。是吗？让我了解一下，保证尽快答复你们。好，珍妮说，明天是街坊节，我们就在这儿等。五朵金花走出办公室，在门前的草坪上坐下来。天角渐渐泛红。
　　⑦春日黄昏那么短暂，像脸盆里的水，洒洒就没了。当校长走出办公室，夕阳已在天边闪烁。校长对姑娘们说，校董们大都同意悬挂中国国旗，并为这个疏忽向中国同学道歉。明天一早，你们会在广场上看到中国国旗的。真的吗？真的。
　　⑧那本该是个安详的夜晚，人在心愿满足后睡得最甜。万万没想到，珍妮她们突然接到校长秘书的电话。秘书说，找来找去，就是找不到一面中国国旗——我只是说，我找不到中国国旗。如果我借你一面你会挂吗？珍妮问。你有？对，我有。当然，当然挂。好，一言为定，明天一早广场上等我。
　　⑨你有国旗？姑娘们把珍妮围起来。咋不早说？害我们紧张半天，死多少细胞！珍妮红着脸低下头，憋了好一会儿才说，对不起，我没有。可我不信就找不到一面国旗！姑娘们立刻打电话到北京，到纽约，到所有可能有国旗的地方，最后终于联系上位于波士顿郊外的哈佛大学中国同学会。怎么给你们？电话里的人问珍妮。麻烦你把国旗放在你家门前的信箱里，我这就去取。珍妮，你疯了？珍妮笑笑，开车单程五小时，争取九小时赶回来。你们明儿一早直接在广场上等我，别忘帮我带好旗袍和化妆盒儿，咱广场见。
　　⑩不知那一夜姑娘们是如何度过的。特别是珍妮，迷过路吗，吃没吃罚单，饿不饿，打盹儿了没有？可以确定的是，太阳升起时，广场上的中国姑娘是五名，一个也不少。珍妮把鲜红的中国国旗交到校长手里。就在校长秘书升旗的瞬间，姑娘们一字排开，请校长为她们在国旗下合影。一，二，校长喊着。等等！珍妮挽起身旁两位姑娘的手臂，接着，她们每个人都相互挽起手臂。现在可以了，校长先生。
　 ⑪清晨很美，像一支奏鸣曲，随风飘荡。      
    【注】陈九：华裔作家，现为纽约市政府资深雇员。

福州平潭综合实验区距台湾本岛仅126km，即将投入世界上航速最快的客滚船在平潭至台湾的海上直航，如图所示，到时从台湾早上7：00出发，当天上午10：00就可到平潭，给两岸人民带来极大便利，根据以上信息回答：

（1）该船从平潭至台湾航行的平均速度为　____ 　km/h．

（2）若船体在海面下的体积为10⁴m³，那么该船受到浮力是　____ 　N．（ρ_海水=1.03×10³kg/m³）

我们要养成乐观向上的生活态度(   )
①应该善于从身边寻找快乐    ②多参加体育锻炼以及音乐、绘画等文化生活
③可以使人不因困难而烦恼    ④能够令人精神抖擞

完形填空
阅读下面短文，从各题A、B、C、D四个选项中，选出可以填入空白处的最佳答案。
    “How does the yard look?” My father asked, with his eyes shining. I could tell he was eagerly waiting for my 1. “Wonderful!” I replied after I gave it a thorough 2 . Then I recited all the changes I had 3 in his yard and he smiled contently.
    When I was young, my mother 4 in a car accident, leaving my father alone to 5 their three young daughters. At the beginning, life was not always6and my younger sisters usually complained. However, Dad always 7 us to believe that life was good. Meanwhile, he tried his best to 8that belief.
    In 1972, my dad developed a piece of waste land that had been9 on Okaloosa Island. Every year at the first sign of 10 , he would begin spending countless hours working there to make it be bursting with colors. Through his continuous hard work, the land 11turned into a beautiful garden with different types of flowers and other unique plants. While our friends were enjoying their vacation through traveling to different places, we were 12 working with my dad in his yard, watering the flowers, weeding or cutting off the branches. Sometimes, our friends were envious of our working vacation, and we would 13 them. Dad made his yard very 14 so that it became our vacation paradise during our childhood.
    For so many years, when we were 15 , we liked to visit Dad's yard, because it could 16us of Dad's belief. It was Dad and his yard that gave us 17 that enabled us to survive and 18 major challenges in life. One day, it shocked us that Dad said he would not 19 the yard. Then he explained, “Twenty years ago I decided to start my work in that yard to tell you life is good. Now my work is done.” We were sitting in 20, recalling what we had experienced. Life was good. Dad was right.