I am always eager to do experiments, especially chemistry ones. It's 21 to work with test tubes and beakers , even though sometimes my efforts end in failure. Experiments were fun for me 22 a recent accident.
The accident happened when I was heating a big test tube with an alcohol burner , chatting to my partner. 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 burnt as I was leaning too close to the test tube.
23 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 24 anything so bad! My mind went blank for a moment. Then I quickly covered the fire with a damp cloth to put it out.
The teacher told me that the test tube broke in half at the bottom because we didn't dry it properly before 25 it.
We calmed down and did the experiment, again. But our hearts were still 26 rapidly even after we walked out of the lab.
But my bad luck didn't end there! Since all our 27 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 pain in my leg. Soon it became more and m6re painful and I touched the area with my fingers, 28 to make things better. But to my great 29 , the material of my trousers turned into powder! Vitriol ! ! ! The terrible word came into my mind. I rushed out right away to wash and examine my poor skin. 30 , it was not a serious injury.
After changing my trousers I thought it's very important to have a serious attitude in chemistry class. Doing scientific experiments as a learner is no laughing matter.
21. A. exciting B. moving C. dangerous D. difficult
22. A. but B. except C. besides D. until
23. A. Because B. Instead C. But D. Or
24. A. felt B. heard C. experienced D. imagined
25. A. boiling B. holding C. heating D. cooking
26. A. striking B. beating C. knocking D. hitting
27. A. effort B. sense C. attention D. spirit
28. A. failing B imanaging C. trying D. planning
29. A. disappointment B. joy C. surprise D. fort
30. A. Luckily B. Obviously C. Unexpectedly D. Generally21—25 ADCCC 26—30 BCCCA
网友回答
(答案→)21—25 ADCCC 26—30 BCCCA
解析：本文通过作者的自身经历说明科学实验是一件很严肃的事情，作为初学者更要严谨细心，不能有丝毫的大意。
21. A 从文中第一句话可以看出作者很乐意去做化学实验，所以，他认为work with test tubes and beakers是一件“令人兴奋的（exciting）”事情。比较其它选项：moving令人感动的；dangerous危险的；difficult困难的；都与文意不符，故选A。
22. D 从下文可知，作者对化学实验的看法的转变是由于一场意外，即直到一场意外的发生才导致“我”对其的看法改变；所以选until直到……为止，其余的都表示“除了”之意。
23. C 由语境可知此处为一个转折，所以用but表示。
24. C 指作者从没“经历（experienced）”这样糟糕的事情！而不是“felt感觉，觉得；heard听说；imagined想象”这样糟糕的事情。
25. C 由第二段的第一句话可以知道，事故发生在容器加热时，所以老师的意思指事故发生的原因是“我们”在“加热（heating）”容器前没有将其烘干。
26. B 心脏跳动用beating；比较其它选项：striking打击，殴打；knocking敲打；hitting打击，碰撞。
27. C “focuse one’s attention”，固定搭配，集中某人的注意力；其它的都不合适。
28. C I touched the area with my fingers的目的是试图减轻腿的疼痛，所以“trying to试图，尝试”的意思最为贴切。
29. C 由语境可知“我”的裤子的材料变成粉末是极大地出乎我的意料的（to my great surprise）而非“使我很失望（disappointment），使我很高兴（joy）或者使我很舒服（fort）”。
30. A 皮肤被硫酸洒到而没有受很大的伤当然是一件很幸运的事，所以选Luckily。