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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. comfort

30. A. Luckily      B. Obviously               C. Unexpectedly           D. Generally

21—25  ADCCC    26—30  BCCCA


解析:

本文通過作者的自身經(jīng)歷說明科學實驗是一件很嚴肅的事情,作為初學者更要嚴謹細心,不能有絲毫的大意。

21. A 從文中第一句話可以看出作者很樂意去做化學實驗,所以,他認為work with test tubes and beakers是一件“令人興奮的(exciting)”事情。比較其它選項:moving令人感動的;dangerous危險的;difficult困難的;都與文意不符,故選A。

22. D 從下文可知,作者對化學實驗的看法的轉變是由于一場意外,即直到一場意外的發(fā)生才導致“我”對其的看法改變;所以選until直到……為止,其余的都表示“除了”之意。

23. C 由語境可知此處為一個轉折,所以用but表示。

24. C 指作者從沒“經(jīng)歷(experienced)”這樣糟糕的事情!而不是“felt感覺,覺得;heard聽說;imagined想象”這樣糟糕的事情。

25. C 由第二段的第一句話可以知道,事故發(fā)生在容器加熱時,所以老師的意思指事故發(fā)生的原因是“我們”在“加熱(heating)”容器前沒有將其烘干。

26. B 心臟跳動用beating;比較其它選項:striking打擊,毆打;knocking敲打;hitting打擊,碰撞。

27. C “focuse one’s attention”,固定搭配,集中某人的注意力;其它的都不合適。

28. C  I touched the area with my fingers的目的是試圖減輕腿的疼痛,所以“trying to試圖,嘗試”的意思最為貼切。

29. C 由語境可知“我”的褲子的材料變成粉末是極大地出乎我的意料的(to my great surprise)而非“使我很失望(disappointment),使我很高興(joy)或者使我很舒服(comfort)”。

30. A 皮膚被硫酸灑到而沒有受很大的傷當然是一件很幸運的事,所以選Luckily。

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