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　　Science seems to be getting closer to answering a very old mystery．Homing pigeons信鸽)can be 　　1　　 hundreds of miles from their homes．When they are let to go to 　　2　　 again, they find their way home．Because of this special ability to 　　3　　, pigeons have been used 　　4　　 messengers for hundreds of years．

　　Today people even breed homing pigeons for 　　5　　 at a sport．The birds are shipped to some chosen 　　6　　 a few hundred miles away．Then all of them are let to go together．The winner is the bird that gets home 　　7　　．A good race can make it home from 500 miles away 　　8　　 a single day．

　　The mystery of the homing pigeons is how they 　　9　　 directions and how they find home．The first part seems to be pretty well 　　10　　, and we know of two ways that pigeons tell directions．First, they use the sun．Experiments show that homing pigeons can tell 　　11　　 by the sun．What happens when the 　　12　　 is darkly overcoat by clouds and no one can 　　13　　 where the sun is?Then the pigeons still find their way home．

　　Naturally, people have wondered whether pigeons might have a built in compass(指南针)－　　14　　 that would tell them about the direction of the 　　15　　 magnetic(磁的)field．Many different kinds of experiments were 　　16　　．Here's what the scientists decided 　　17　　 they had made experiments many times．When pigeons can see the sun, they use it as their 　　18　　 means of direction-finding．When they can't see the sun, they use some 　　19　　 way to sense direction from the earth's magnetic field．

　　But how do pigeons know 　　20　　 direction is toward home?What do they use that we would call a map?These are other questions to be answered．

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　　While I was standing at the kitchen window, five－year－old Spencer, my oldest son, ran into the house 　　1　　,“We need a doctor out here!We need a doctor!Hurry, Mom!”“What's wrong?”I asked．Spencer anxiously told me he had found a dead bird that needed a doctor．

　　Dutifully(顺从地)，I seized a small plastic bag from the cupboard and took Spencer's hand－　　2　　, that's the sort of thing mothers do!While my son led me out of the door and 　　3　　 the bird, I explained that if the creature was indeed dead, a doctor could not 　　4　　．When we arrived at the 　　5　　 scene, it was obvious that the baby bird was dead．Spencer and I could see the nest(鸟巢)high up in the tree．My son and I 　　6　　 the probable age of the baby bird, its inability(无能力)to fly well, and exactly how the 　　7　　 had caused its death,“I think his mommy and daddy really 　　8　　 him,”Spencer observed．I 　　9　　 my boy's hand and tried to ease his 　　10　　 by saying I was sure they did, 　　11　　 they would be okay because the little bird had gone to Heaven to be with God and PoPo(my deceased(去世了的)grandfather)．I assured(使确信)Spencer that the 　　12　　 and loved．I told Spencer that PoPo loved one would be 　　13　　 he was in Heaven holding and playing with the baby bird 　　14　　．I pick up the little creature's body, slipped(悄悄放到)it into my plastic bag an 　　15　　 placed the bird in the rubbish bin．　　16　　 was said about the matter for the rest of the day．Spencer went right back to playing 　　17　　 he had never been interrupted, and I returned to my work in the kitchen．

　　At breakfast the next morning, Spencer sadly explained to his father that he had found a baby bird the day before that had fallen from its nest．

　　“It was dead, Daddy!”

　　Trying to 　　18　　 Spencer's spirits and remind that the little bird was really 　　19　　, I asked our son to tell Daddy 　　20　　 the baby bird was．Spencer, looking solemn faced at his dad, stated,“In the rubbish bin with Mama's granddad, PoPo．”

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　　It was very early when men first began to drill for oil．But as you probably know, their 　　1　　 were not scientific．They just 　　2　　 round the country and asked themselves：“　　3　　 shall we drill a well?”Sometimes they chose the 　　4　　 because they found oil on the 　　5　　．But they chose the place for no 　　6　　 reason．They took a 　　7　　．

　　Drilling an oil well is 　　8　　, and the work can be 　　9　　．In the past there were often 　　10　　．Sometimes the drill suddenly 　　11　　 the rocks into an oil trap．The great 　　12　　 inside the trap then caused an explosion(爆炸)．Oil and gas shot up the 　　13　　 and made great gushers(自喷井)in the 　　14　　．Sometimes there were great 　　15　　, which people could see many 　　16　　 away．

　　Today drilling is very scientific．Scientists and engineers plan 　　17　　 of the work．They plan the number of wells．They chose their positions in the 　　18　　．They also advise and 　　19　　 the men who drill the wells．

　　As a 　　20　　 there are very few accidents today．

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　　Since the earliest times, trees have always been very useful and important 　　1　　 man who made use of them 　　2　　 many ways．Even today trees continue to serve man in so many ways．Trees supply man 　　3　　 fruits and building material in the form of 　　4　　．Without trees it would be 　　5　　 to build houses, boats, and even bridge．Furniture 　　6　　 tables, chairs and beds is made 　　7　　 wood．

　　In the tropics 　　8　　 is very hot throughout the year, trees protect man from the terrible heat．They are also useful in preventing good and rich top soil from 　　9　　 away during heavy rains which are 　　10　　 in the tropics．If there were no trees of vegetation of some kinds 　　11　　 back the soil with their roots, heavy rains would wash away the rich surface soil 　　12　　 is so important and necessary to agriculture．The result is 　　13　　 the land becomes a desert．

　　There are so many desert areas in the world．　　14　　 these desert areas must have been very rich fertile areas, but 　　15　　 our ancestors(祖先)in the distant past did not have enough knowledge about science of 　　16　　 nature, they 　　17　　 all the trees in the areas 　　18　　 they lived and never planted new ones．　　19　　, the rich soil was blown away and washed away by strong winds and heavy rains．In the end the land was turned 　　20　　 useless deserts where nothing could grow．

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　　My father often works very hard．And he has 　　1　　 to see a film．Here I'll tell you 　　2　　 about him．One afternoon, when he finished his work and 　　3　　 go home, he found a film ticket under the 　　4　　 on his desk．He thought he 　　5　　 to have not much work to do that 　　6　　 and it was quite wonderful to pass the 　　7　　 at the cinema．

　　So he came back home and 　　8　　 finished his supper．Then he said 　　9　　 to us and left．But to our 　　10　　, he came back about half an hour later．I 　　11　　 him what was the matter．He 　　12　　 and told us about the funny thing that had happened at the cinema．

　　When my father was sitting in his seat, a 　　13　　 came to my father's seat and said that the seat was 　　14　　．My father was surprised．He took out the ticket 　　15　　 looked at it carefully．It was Row 17, 　　16　　．And then he looked at the seat．It was the same．So he asked her 　　17　　 her ticket．She took out the ticket at once and the seat shown in it was Row 17, seat 3．

　　　　18　　?What's the matter with all this?While they were wondering suddenly the woman said,“The 　　19　　 of the tickets are different．”So they looked at the tickets more carefully．After a while my father said,“Oh, 　　20　　, I made a mistake．My ticket is for the film a month ago．Take this seat, please．”With these words, he left the cinema．

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John had to go to work．So he set off half an hour 　　1　　 than usual arrived at the library before anybody else．The 　　2　　 to come was Mr．Steele, who thought,“This must be a wonder(令人惊奇的事)．”John is 　　3　　 the first here．If he came as 　　4　　 as this every morning, he would get a lot more 　　5　　 done．John began to get on with his work and by half past nine he had 　　6　　 all the postcards he had to write．It was a quarter to ten, and Mary had not arrived 　　7　　．He wondered(想知道)　　9　　 she was ill or if she had taken the day 　　8　　．But Mr．Steele came and 　　10　　 him if he knew where Mary was,“If she were ill, she would 　　11　　,”he said．It isn't like her．She is usually 　　12　　．John said that he had no 　　13　　 where Mary was．But 　　14　　 the door opened and there was Mary．She was looking very 　　15　　 and tired．She apologized to Mr．Steele and explained that she had been 　　16　　 most of the night．She hadn't 　　17　　 to sleep until five in the morning and had overslept．Mr．Steele was very 　　18　　 and suggested that she take the day off．She 　　19　　 him and said she would stay, but she 　　20　　 said a word for the rest of the morning．John, on the hand, was feeling happy, so at one o'clock he suggested Mary that they go and have lunch together, and she agreed．

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　　A successful scientist is generally a good observer．He makes full 　　1　　 of the facts he observes．He doesn't accept ideas which are not 　　2　　 on obvious facts, and therefore refuses to accept authority(权威)as the only 　　3　　 for truth．He always 　　4　　 ideas carefully and makes experiments to prove them．

　　The rise of 　　5　　 science may be considered to 　　6　　 as far back as the 　　7　　 of Roger Bacon, the wonderful philosopher(哲学家)of Oxford, who lived 　　8　　 the years 1214 and 1292．He was probably the first in the middle 　　9　　 to suggest that we must learn science 　　10　　 observing and experimenting on the things around us, and he himself 　　11　　 many important discoveries．

　　Galileo, however, who lived more than 300 years later, was the greatest of several great man, 　　12　　 in Italy, France, Germany, or England, began by 　　13　　 to show how many important 　　14　　 could be discovered by observation．Before Galileo, learned men believed that large bodies fell more 　　15　　 towards the earth than small ones, 　　16　　 Aristotle said so．But Galileo, going to the 　　17　　 of the learning Tower of Pisa, let fall two 　　18　　 stones and proved Aristotle was wrong．It was Galileo's 　　19　　 of going direct to Nature, and proving our 　　20　　 and theories by experiment, that has led to all the discoveries of modern science．

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　　Ebron James isn’t the first high school basketball player to go straight into the NBA, but he’s probably the best．He has the body, skills and the basketball brain of an All-Star(全明星球员)．

　　This 　　1　　 was on 　　2　　 as he scored 41 points to take Cleveland Cavaliers(克里夫兰骑士队)to a 107-104 win over the New Jersey Nets(新泽西网队)on March 28．Aged of 19 years and 87 days, James became the 　　3　　 player to score 40 or more in the NBA．“It was by far James’ best 　　4　　, ”said Cleveland coach Paul Silas．Known to his friends 　　5　　“the king”, this was the day James earned his crown(王冠)．But he was 　　6　　 from being a king during a childhood spent in the back streets of Akron, Ohio．　　7　　 many other African-American basketball players, James’ early years were a 　　8　　．His mother Gloria was just 16 when she gave birth to him; he knows nothing about his father．Mother and son battled for everything from food to a place to live．　　9　　 help from his grandmother and neighbours, James would 　　10　　 have died when he was young．

　　This spirit of survival has served him well on court, forcing him to take any 　　11　　 he finds．“I 　　12　　 losing, I don’t like losing, ”said James of his 41-point display．“I 　　13　　the opportunity for us to win and I was 　　14　　 to capture it．”At 2．03 metres, he is not Yao Ming but this didn’t 　　15　　 him being first choice in 2003 NBA draft．This was 　　16　　to his strength and skill, much of which he learned from high school American football．

　　Although he has a 　　17　　 brain, James has never had to concentrate on 　　18　　．Some people think this is a mistake and say he should have gone to college to 　　19　　 his mind．But James is one of the lucky few who has found fame and fortune 　　20　　 a diploma(文凭)．On the court, he is king．

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　　This autumn was the wettest since records began in the UK．Floods 　　1　　 large parts of the country．In Australia floods have covered an area the 　　2　　 of the whole of Britain．How does it happen?Cars, factories and power stations 　　3　　 carbon dioxide(CO₂)into the air．This gas 　　4　　 the atmosphere and causes the polar ice to 　　5　　．Sea level across the world 　　6　　．What are we going to do about it?In 1990, leaders of all the big nations met in Japan and agreed to reduce 　　7　　 CO₂ they put into the atmosphere．Ten years 　　8　　, in November 2000, they met again in Holland to assess(评估)the situation and decide what to do next．Maybe the following is one of the ways．

　　The village of Yaluman 　　9　　 in the mountains of Chiapas, a province of southern Mexico．Its people are Mayan Indians．They are some of the poorest people in a poverty 　　10　　 country．　　11　　 now they have an extra source of income．They are being 　　12　　 to grow, develop and 　　13　　 forests by the organization in 　　14　　 of Formula One racing(一级方程式赛车)．

　　Every year, the global Formula One racing pumps 5500 tons of CO₂ into the atmosphere．The idea is that the forests being planted around Yaluman will absorb(take in)this amount．It will also provide local people 　　15　　 money while 　　16　　 out motor racing’s environmental debt．

　　Projects 　　17　　 this go under the name of“Carbon trading”．The basic 　　18　　 is that governments and companies can buy the 　　19　　 to pump CO₂ into the air by investing(投资)in green 　　20　　 that take it out again．

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　　I don’t know What’s your opinion about mountains．

　　It was only in the eighteenth century　　1　　people in Europe began to　　2　　that mountains were beautiful．　　3　　 that time, mountains were feared by the people　　4　　 on the plain, especially by the city people, 　　5　　 they were wild and 　　6　　 places　　7　　 one was easily 　　8　　 or killed by terrible animals．

　　Slowly, however, 　　9　　 people 　　10　　 comfortably in the towns began to grow 　　11　　 them．They began to feel 　　12　　 looking for wild excitement, as their attention turned from the man-made town to the 　　13　　 country; and to places 　　14　　 dangerous and wild．So high mountains began to be 　　15　　 for a holiday．

　　Then, mountain-climbing began to grow popular 　　16　　．To some people, there is something 　　17　　 about getting to the　　18　　of a high mountain：a struggle against nature is finer than a battle 　　19　　 other human beings．And after a difficult climb, what a　　20　　reward it is to look down on everything within sight．

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