阅读下面短文，掌握其大意。然后各题所给的四个选项(A、B、C和D)中，选出最佳选项。

　　As long as I can remember, I was a weak child always short of energy．When I 　　1　　 four, everything seemed to go wrong．I had asthma(哮喘)．I was in and out of 　　2　　 offices many times, but they could never 　　3　　 what was wrong．

　　One night, I had a fever．My parents 　　4　　 me to the emergency room, 　　5　　 they were told that I needed my appendix(阑尾)taken out．I was getting worse by the 　　6　　．Finally, my feet became unconscious．My parents 　　7　　 down．At that point, the doctors knew it was 　　8　　 my appendix．

　　The next day, I was taken to the children's hospital．After two weeks of treatment, I was still not 　　9　　．My kidneys were only working 2 percent of the time and if 　　10　　 wasn't done, I would die．

　　My parents were faced with 　　11　　 they never thought they would have to make：steroids(类固醇), dialysis(透析)or a transplant．

　　That night, my dad sat by my bed, thinking it would be too much for me but all of a sudden, I 　　12　　 up and gathering all the 　　13　　 I had-I punched(hit)him on the nose! He knew then that I was not going to give up 　　14　　 a fight．

　　The next morning I was given a transplant．Within 　　15　　 days, I started showing steady 　　16　　 of improvement, but my parents were told, “Krissy will never have as much energy as a normal kid, even if she 　　17　　．”

　　Within four days I was strong enough to return home．Gradually, I was taken 　　18　　 the medicine and my doctors’ visits grew further 　　19　　．But still, I was given no chance of a full recovery．

　　Well, now, ten years later, I do well in everything, and I am a living magic to my doctors, family and friends．I thank God every day for giving me my life．Even if you are only given a two percent chance of 　　20　　, that's all you really need．

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　　The science teacher believed very strongly in practical work by means of teaching science effectively, and she 　　1　　 her pupils’parents to see how 　　2　　 their children were learning by her methods．She 　　3　　 arranged for all the parents to come and see the 　　4　　 of one of the children’s experiments on a Saturday evening when all of them were 　　5　　．

　　The children had been studying how 　　6　　 grew, and they had planted four pots of flowers a few weeks 　　7　　．They had put poor soil in one pot to see what effect this would have on how the flowers grew in it, and good soil in the other 　　8　　 The flowers in this pot were planted in 　　9　　 soil．”

　　“This pot has been kept in the dark for four days．”

　　“These flowers have had no 　　10　　 for four days．”

　　“These flowers have had good soil, 　　11　　 of light and regular water．”

　　Then the teacher went home．

　　When she 　　12　　 on Saturday evening, half an hour before the parents came, she 　　13　　 this note beside the pots：“We 　　14　　 your notes to the school servant and we thought we would help him, so we watered all the plants, changed the earth in the one with poor soil, and 　　15　　 the light on above the one that had been left in the dark for four days．We 　　16　　 that the plants will grow better．”

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