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.
【小题1】A．excitingB．movingC．dangerousD．difficult【小题2】A．successB．failureC．lossD．waste【小题3】A．butB．exceptC．besidesD．until【小题4】A．incidentB．changeC．disasterD．accident【小题5】A．physicalB．chemicalC．biologicalD．historical【小题6】A．brokenB．burntC．blownD．pulled【小题7】A．AndB．InsteadC．ButD．Or【小题8】A．feltB．heardC．experiencedD．imagined【小题9】A．headB．stomachC．earD．mind【小题10】A．leave it outB．let it outC．give it outD．put it out【小题11】A．boilingB．holdingC．heatingD．cooking【小题12】A．strikingB．beatingC．knockingD．hitting【小题13】A．feelingB．timeC．chanceD．luck【小题14】A．effortB．senseC．attentionD．spirit【小题15】A．pushB．painC．biteD．touch【小题16】A．failingB．managingC．tryingD．planning【小题17】A．disappointmentB．joyC．surpriseD．fort【小题18】A．FortunatelyB．ObviouslyC．UnexpectedlyD．Generally【小题19】A．coatsB．shirtsC．socksD．trousers【小题20】A．heartB．attitudeC．thoughtD．preparationA
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(答案→)A
解析：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。