The girl had tears in her eyes，and I felt__28__of myself for ever having felt like giving up.For that one moment，the only thing that__29__to me was that this girl should have a successful experiment.She was going to go home that day with a__30__on her face.I bent over her alcohol lamp，and with a long kitchen match tried to reach the wick.I was so__31__to the match that I could feel the flame.Finally the wick caught fire，and I looked up triumphantly(得意洋洋地)，__32__the smile on the girl's face.
__33__，she took one look at me and began screaming in fear.I did not understand why the kids were all pointing at me__34__I realized that the flame had lit my hair.Several kids ran to me and__35__at my head.Talk about a dream come true—they got to hit their teacher on the head and say they were__36__him. A few minutes later，all was well and I watched the kids__37__ the experiment.I felt like an idiot，and yet for the first time in weeks，I felt how much I__38__about teaching.I had tried hard to help someone; though not particularly well，but the__39__was there.From that moment，I determined to always teach like my hair was__40__．
【语篇解读】 本文是一篇记叙文。作者是一位教学多年的化学老师，对教学工作有点倦怠以至于怀疑教书的价值。但是一次化学实验中发生的事故改变了他的这种想法。 21．A.Instantly C．Hopefully
B．Fortunately D．Absolutely
B [考查副词辨析。根据“a ridiculous moment in class lit my way out of the darkness”可知选B。instantly“立即”；fortunately“幸运的是”；hopefully“满怀希望地”；absolutely“绝对地”。] 22．A.excited C．skeptical
B．embarrassed D．particular
A [考查形容词辨析。根据生活常识，学生做化学实验时对于实验器材是感兴趣的，所以只能选褒义的形容词。excited“兴奋的”；embarrassed“尴尬的”；skeptical“怀疑的”；particular“特定的，挑剔的”。故选A。] 23．A.first
B．best
C．last D．very
C [考查限定词辨析。根据“a girl couldn't get her wick (灯芯) to burn”可知这个女孩动手能力差，所以应该是最后(last)一个被选入小组的。] 24．A.accepted C．declared
B．denied D．hoped
A [考查动词辨析。女孩似乎接受(accept)了她只是一个普通女孩的事实。deny“否认”；declare“宣布”；hope“希望”。] 25．A.practice C．inaccuracy
B．accidents D．failure
D [考查名词辨析。通常情况下，我不会干预科学实验，因为失败有时会是学习过程的一部分。practice“练习”；accident“事故”；inaccuracy“不精确”；failure“失败”。故选D。] 26．A.dry C．thick
B．big D．long
D [考查形容词辨析。根据“with a long kitchen match tried to reach the wick”可知，我认为这个酒精灯的灯芯不够长(long)，所以女孩无法点燃它。] 27．A.step in C．step up
B．step aside D．step down
A [考查动词短语辨析。根据6空所在句子的含义可知，此处指我需要介入这个酒精灯的处理。step in“介入，援之以手”；step aside“让位”；step up“走上前去”；step down“让位，下台”。故选A。] 28．A.proud C．tired
B．aware D．ashamed
D [考查形容词辨析。女孩的泪水让我感到惭愧，因为自己曾经想放弃(教学)。 proud “骄傲的，自豪的”；aware“知道，意识到”；tired“累的”；ashamed“感到惭愧的”。故选D。] 29．A.happened C．mattered
B．attended D．related
C [考查动词辨析。对我而言唯一重要的就是这个女孩应该成功地做实验。happen“发生，恰巧”；attend“参加，出席”；matter“有关系，要紧”；
relate“联系”。故选C。] 30．A.fear C．shame
B．smile D．surprise
B [考查名词辨析。根据前文的“a successful experiment”可以推断，她将会面带笑容(smile)回家。fear“害怕，恐惧”；shame“羞愧”；surprise“吃惊”。] 31．A.accessible C．low
B．close D．short
B [考查形容词辨析。根据后文中的“I could feel the flame”可以推断，我与火柴离得很近(close)。accessible“易得到的，易接近的，易理解的”；low“低的”；short“短的”。] 32．A.expecting C．missing
B．finding D．imagining
A [考查动词辨析。根据前文提到的我得意洋洋的神情可以推断，我此时肯定期待女孩面带微笑，因为灯芯点着了。expect“预料，期待”；find“发现，觉得”；miss“错过，思念”；imagine“想象”。故答案是A。] 33．A.Rather C．Still
B．Besides D．Instead
D [考查副词辨析。根据空格后的句子“she took one look at me and began screaming in fear”可知，实际情况与我的期待相反，所以空格处所填词应该是Instead。rather“相当”；besides“除了??之外(还有)”；still“仍然”。] 34．A.as C．until
B．when D．since
C [考查连词辨析。not ...until意为“直到??才”，该句意为“直到我意识到火焰点燃了我的头发我才理解孩子们都用手指着我的原因”。as“因为，正如”；when“当??时”；since“自从，既然”。] 35．A.looked C．hit
B．shouted D．waved
C [考查动词辨析。根据后文中的“hit their teacher on the head”可知，几个孩子向我跑来并打我的头。look“看”；shout“叫喊”；hit“袭击，打”；wave“挥动”。故选C。]