鉴别下列各组物质，试剂(括号内物质)选择错误的是（ ）

如果你是下图中一位榜上有名的考生，你不可能(   )

阅读下面的文字，完成下题。

                                                                                                                       春（节选）

                                                                                                                          朱自清

        ①小草偷偷地从土地里钻出来，嫩嫩的，绿绿的。园子里，田野里，瞧去，一大片一大片满是的。坐着，躺着，打两个滚，踢几脚球，赛几趟跑，捉几回迷藏。风轻悄悄的，草软绵绵的。

        ②桃树、杏树、梨树，你不让我，我不让你，都开满了花赶趟儿。红的像火，粉的像霞，白的像雪。花里带着甜味；闭了眼，树上仿佛已经满是桃儿、杏儿、梨儿。花下成千成百的蜜蜂嗡嗡地闹着，大小的蝴蝶飞来飞去。野花遍地是：杂样儿，有名字的，没名字的，散在草丛里像眼睛，像星星，还眨呀眨的。

        ③“吹面不寒杨柳风”，不错的，像母亲的手抚摸着你。风里带着些新翻的泥土的气息，混着青草味儿，还有各种花的香，都在微微润湿的空气里酝酿。鸟儿将巢安在繁花嫩叶当中，高兴起来，呼朋引伴地卖弄清脆的喉咙，唱出婉转的曲子，跟轻风流水应和着。牛背上牧童的短笛，这时候也成天嘹亮地响着。

        ④雨是最寻常的，一下就是三两天。可别恼。看，像牛毛，像花针，像细丝，密密地斜织着，人家屋顶上全笼着一层薄烟。树叶儿却绿得发亮，小草也青得逼你的眼。傍晚时候，上灯了，一点点黄晕的光，烘托出一片安静而和平的夜。在乡下，小路上，石桥边，有撑起伞慢慢走着的人，地里还有工作的农民，披着蓑戴着笠。他们的房屋，稀稀疏疏的，在雨里静默着。

    “Who can ever have imagined someone like me would make it this far?” asked Chad Wood last week during his high school graduation speech as the best student. Chad offered1to his fellow classmates to never give up---and the words2much more to himself. That's because Chad is deaf, and he told the story of the serious troubles he3to graduate first in his class at Harrison High school in Kennesaw, Georgia.

    Chad didn't start to4until he was 5, according to his mother, Pam Wood. Although her son was5a disadvantage, she was determined not to treat him6. “I've expected him to do everything every other kid does, and I saw no7why he couldn't,” she told ABC News. “And if he8the first time, we just tried again.”

    Chad, 17, worked hard throughout school,9no special treatment but sitting at the front of the class and using a special audio system so he could hear the teacher. All his hard work10. He received full school fare to Vanderbilt University. “Deafness had taught me a lesson to never11,” he said in the speech. “Not when the experts tell you it cannot be done. Not when you have12so far behind that escaping seems the only way 13. Not when achieving your dreams seems an entire14.”

    Chad spoke for about four minutes, after which he received a standing applause from the class and15messages from family, friends and strangers. “They've been sending me messages on Facebook, email, they've been talking to me in person telling me how it had a16on their lives and how they're really17by it,” Chad told ABC News. “It feels18. Seeing that my words19have a power on someone and that they want to work harder because of my words makes me feel20.”