I am always eager to do experiments, especially chemistry ones. It's _26_ to work with test tubes and beakers（烧杯） , even though sometimes my efforts end in__27___. Experiments were fun for me __28 a recent accident. The 29 happened when I was heating a big test tube with an alcohol burner（酒精灯） , chatting to my partner while waiting for__30____ changes. All of a sudden, the tube cracked. Even though I jumped from my seat when I heard the crack, the hair on my forehead was __31____ as I was leaning too close to the test tube. __32___ I had no time to be sad about my hair: the liquid in the test tube poured onto the table and caught fire. I'd never 33 _ anything so bad! My___34___went blank （空白）for a moment. Then I quickly covered the fire with a damp cloth to__35____. The teacher told me that the test tube broke in half at the bottom because we didn't dry it properly before __36___ it. We calmed down and did the experiment, again. But our hearts were still __37____ rapidly even after we walked out of the lab. But my bad __38___ didn't end there! Since all __39 was focused on the flames while we were in the lab, I didn't see the liquid falling onto my trousers. During the following class, I felt a __40___ in my leg. Soon it became more and more painful and I touched the area with my fingers, _41_ to make things better. But to my great 42___ , the material of my trousers turned into powder! “Vitrio（硫酸）! ! !”The terrible word came into my mind. I rushed out right away to wash and examine my poor skin. _43_ , it was not a serious injury. After changing my __44____I sat down and told myself: danger is no joke! It's very important to have a serious___45___ in chemistry class. Doing scientific experiments as a learner is no laughing matter.
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小题1:A
小题2:B
小题3:D
小题4:D
小题5:B
小题6:B
小题7:C
小题8:C
小题9:D
小题10:D
小题11:C
小题12:B
小题13:D
小题14:C
小题15:B
小题16:C
小题17:C
小题18:A
小题19:D
小题20:B
题目分析：文章介绍了我在化学实验课上遇见的两个事故，告诉我们对待任何事物要有一个认真的态度。
小题1:A 上下文串联。根据eager to do experiments说明做实验对我来说是令人兴奋的。
小题2:B 上下文串联。根据even though说明有转折关系，很多时候我的实验回失败。
小题3:D 词义辨析。A但是；BC除…外；D直到…才；指直到最近的一次实验，实验对我来说是都是很有趣的。
小题4:D 上下文串联。根据28空后的a recent accident说明D正确。
小题5:B 上下文串联。根据文章第一句我喜欢化学实验，那么在实验中应该发生化学变化。
小题6:B 词义辨析。A坏了；B烫伤；C吹走；D拉走。这里指被前额的头发被烫坏了。
小题7:C 连词辨析。根据上下文可知我没有时间为头发而难过，实验的液体流了下来。
小题8:C 动词辨析。A感觉；B听说；C体验；D想象。指我从来没有经历过这样的事情。
小题9:D 名词辨析。A头；B胃；C耳朵；D大脑，思维。指我的大脑一片空白。
小题10:D 短语辨析。A遗漏；B释放；C发出；D扑灭。指我要扑灭火。
小题11:C 动词辨析。A沸腾；B握住；C加热；D做饭。指我在加热前没有把试管擦干。
小题12:B 动词辨析。A敲打；B跳动（心脏）C敲门；D击打指我的心跳得很快。
小题13:D 上下文串联。接下来我又发生了事故，说明我的厄运连连。
小题14:C 名词辨析。A努力；B感觉；C注意力；D精神。我的注意力都集中在火苗上了。
小题15:B 词义辨析。A推；B痛苦，疼痛；C咬；D触摸；指我感觉到腿部有地方疼。
小题16:C 动词辨析。A失败；B成功做…；C努力做…;D 计划做…；指我想努力减轻疼痛。
小题17:C 名词辨析。A失望；B快乐；C惊讶；D安慰。让我惊讶的是，这样的物质变成了粉末。
小题18:A 副词表示。A幸运地；B明显地；C未预料到；D一般说来。指幸运地是我的伤不严重。
小题19:D 上下文串联。根据上文可知我的裤子坏了，那么应该是换了一条裤子。
小题20:B 名词辨析。A心；B态度；C想法；D准备。对待化学课要有认真的态度。
点评：本文是近年来高考中常考的题型，讲述一个故事，发表议论，得出一个结论。要注意文章的细节上下文理解，和词义的辨析。