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在试验中重复的主要作用是( )和( )。

【参考答案】

估计试验误差，降低试验误差

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During the years of depression(萧条), food and money were very hard to find and people had to tradethings with each other. One day I was 1 some potatoes from Mr Miller. I noticed a small poor boy hungrily 2 a fullbasket of freshly picked green peas. Then I was 3to see that Mr Miller sold the boy a bag of peas for just a marble (弹球). Mrs Miller, who had been standing nearby, 4_ and told me that Mr Miller loved to trade with thethree boys in the village for peas, tomatoes, and other things 5he didnt really need any marbles. I leftthe stand, smiling to myself, 6 by this man. Several years went by. One day I learned that Mr Miller had dieD.I took part in the funeral(葬礼),her and moved on, 8their eyes. Our 9came to meet Mrs Miller. I mentioned10 she had told me about the 11 She told me, Those three young men above were the boys I told you about. They just told me 12 they appreciatedthe things Jim traded with them. Now, at last, they came to pay their debt. Weve 13 had a great deal of the wealth in this world, she 14 , but right now, Jim wouldW#W$ W%.K**S*&5︿U consider himself to be the 15 man. Then she gently lifted the16 fingers of her husbanD.Resting underneath were three red marbles. At that time I realized that we would not be 17 by our words, but by our kind 18 . It is said thatit takes a minute to find a 19 person, an hour to appreciate him, a day to love him, but an entire life to( )1. A.buying ( )2. A.reaching for( )3. A. astonished( )4. A.turned over( )5. A.but ( )6. A.suspected( )7. A.discovering( )8. A.closing( )9. A.time ( )10. A.the story ( )11. A.marbles( )12. A.why( )13. A.ever ( )14. A.laughed ( )15. A.honest( )16. A.lifeless( )17. A.thought( )18. A.deeds ( )19. A.strict( )20. A.ignoreB.sellingB.glancing at B.amazed B.going overB.otherwiseB.impressedB.watching B.rollingB.chanceB.the proverb B.men B.how B.always B.cried B.happiest B.regretlessB.touched B.things B.honest B.forget C.borrowingC.staring atC.annoyedC.came overC.or C.regretted C.findingC.cleaningC.turn C.the legendC.debt C.when C.neverC.sighedC.coldestC.uselessC.rememberedC.remarksC.specialC.recognizeD.hunting D.picking upD.worried D.coming over D.although D.embarrassed D.seeing D.wiping D.decision D.the joke D.lifeD.whatD.seldom D.added D.richest D.hopeless D.affected D.rewards D.learned D.remind

A.
B.

C.

D."
E.K**S*&5︿U
F."

G.

H.I.  astonished
(

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