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A W hy,you m ay wonder,should spiders (蜘蛛)be our friends?Because they destroy so m any insects, including som e of the greatest enem ies of the hum an race.Insects would m ake it im possible for us to live in the world;they w ould devour(吞食)all our crops and kill our cattle,if it were not for the protection w e get from insect-eating anim als. W e ow e a lot to the birds and beasts who eat insects,but all of them put together kill only a very sm all am ount of the num ber destroyed by spid… 相似文献
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1. If three cats can kill three rats in three minutes, how long will it take 100 cats to kill 100 rats?2. A little American and a big American were in a car. The little American was the big American's son, but the big American was not the little American's father. who was it? 相似文献
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A wolf and a fox were good friends.One day the wolf caught a chicken,and said to the fox,"Go and kill it,cook it well.I’ll invite the bear to share it with us."The fox agreed and boiled the chicken.Soon it was ready.The chicken was so delicious that he couldn’t stand it.He ate up a chicken wing,then a chicken leg...Soon all the chicken was eaten up by him!After a while,the wolf returned home.He asked,"Is the chicken ready?""More or less!"answered the fox guiltily~1. 相似文献
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《海外英语》2003,(5)
THE WOLF IN SHEEP 'S CLOTHING 披着羊皮的狼A Wolf once found a Sheep' s skin, and, thinking he would have an easy way of getting his prey, wrapped himself in it and slipped into the sheepfold with the flock, intending to kill all he wanted during the night.But soon after the Shepherd had made the door fast, he found he had nothing for supper, and, going in with an ax to kill a sheep, he mistook the Wolf for one of them and killed him on the spot.The wicked often fall into their own traps. 相似文献
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Author Unknown 《海外英语》2007,(6):16
When we were young, we had dreams and expectations. We imagine things, we keep thinking about what we want to be, what we want to do, what makes us proud and happy and what we will become. We grew up, and things seemed like having its own way. We accept our success or failures and we move on. The rapid change, the need to do the urgent things, the works, the pressures and the failures, all kill part of our visions. Things have changed, but they cannot really take away the dreams. We still have to dream on, to visualize our desires, our wants, our vision of our future, even when we are considered too old for such things. 相似文献
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MAHAR Ali Nawaz MUNIR Muhammad ELAWAD Sami GOWEN Simon Richard HAGUE Nigel Graham Meckenzi 《Journal of Zhejiang University. Science. B》2004,(10)
Cells and cell-free solutions of the culture filtrate of the bacterial symbiont, Xenorhabdus nematophila taken from the entomopathogenic nematode Steinernema carpocapsae in aqueous broth suspensions were lethal to larvae of the diamondback moth Plutella xylostella. Their application on leaves of Chinese cabbage indicated that the cells can penetrate into the insects in the absence of the nematode vector. Cell-free solutions containing metabolites were also proved as effective as bacterial cells suspension. The application of aqueous suspensions of cells of X. nematophila or solutions containing its toxic metabolites to the leaves represents a possible new strategy for controlling insect pests on foliage. 相似文献
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That was Tuesday, and all the rest of the week Jack and Sally were very busy. First they took the tickets around to all the families in the twobuildings. That was easy after they'd rung the first few doorbells. Miss Fid- 相似文献
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《世界儿童(小学生阅读版)》2003,(6)
We went looking for Jim's friends. They were all together at the playground. In fact, they were worried about the presents for Jim. 相似文献
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One morning I asked Friday to go to theseashore, and see if he could get some fish.Very soon he came running back.He cameflying up the ladder over the fence,lookingvery frightened. “Master,Master.”he cried. “O bad!One,two.three boats!One,two,three!” Friday thought the savages were returningto kill him.He was 相似文献
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That was tuesday,and all the rest of the week jack and sally were very busy.first they tookthe tickets around to all the families in the two buildings.that was easy after they‘d rung the first few doorbells.miss fidgett said, 相似文献
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《语数外学习(高中版)》2014,(9):1-1
There was a （lense forest. And all the h-ees were straight anti tall. Their trunks were broad and shapely. 相似文献
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We are not alone in the world. We human beings could not survive without all the plants and animals around us. Animals are our friends. We must help them and protect them. Unfortunately, some people don't realize the importance of protecting animals. They cut down many trees for making paper, furniture and so on. More and more trees are cut down and fewer and fewer areas are left for wild animals, so they are endangered. Some people not only cut down too many trees, but also kill animals. T… 相似文献
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The Inspector of Schools arrived yesterday morning, and he spent the whole day examining the classes. The headmaster had told us a few days 1 that he was coming. I think the headmaster was very 2 about it, for every day, he came to all the classes, 3 the teacher over and over again what they must do and examined the boy himself to see 4 they were ready for the Inspector. He told us in our class that we were all fools and would be sure to 5 him lose face before the Inspector. 相似文献
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Volatile organic compounds （VOCs） emitted from three types of carpets used in aircrafts were compared by using headspace and dynamic chamber tests. The headspace samples contained many compounds that were not detected in the dynamic chamber test;in addition, the dominant VOCs found by these two methods were different. The findings indicate that for highly sorptive materials such as carpets, headspace analysis may give inaccurate indication of actual VOC emissions, and it is necessary to conduct dynamic chamber tests over a certain period of time in order to identify the true emission characteristics. From the dynamic chamber tests, 2-ethyl-1-hexanol was the main VOC emitted from all three carpets. The study also examined the emission characteristics of aircraft carpets. In all experiments, total VOC （TVOC） concentration peaked within a few hours after the start of the experiment and was followed by rapid decay. The emission parameters of TVOC emitted by all three carpets were calculated and the simulated data matched the measured data well. 相似文献
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《Reading and Writing(初中版)》2006,(9)
One day when the birds were all together, they found a very beau- tiful rose by itself on a small bush. Each bird wanted to have the rose for itself so they decided to give it as a prize to the most beautiful of them all . One by one the birds of the worl… 相似文献