Nobody can work well if he is distracting .

The only way to conquer a fear is to face it, and doing so as frequently as possible.

根据下列材料，回答题
    For the 26 month．mysterious falls of large chunks of ice(冰雹) 27 rained down on Spain and Italy．Juana Sanchez。a 70一year—old woman in Almeria，southern Spain，was knocked 28 when she was struck on the shoulder by a falling ice chunk 29 she walked in a street 30 her home．On January l2，just about 200 miles away in Seville，a man narrowly 3l serious injury when a 9-pound ball of ice32into his car．33 me evening of January 27 priests  at the salesian monastery in L，Aquila，Italy were startled by．a loud crash． 34 the noise，the dlscovered a large chunk of ice on their yard，35  intact． Upon examination。the block of ice 36 in at 2 kilograms and no source 37．On the same day，about l00 miles northeast in Ancona,Italy，the local officials were called to investigate the report of a maIl 38 was struck
    39 the head by a l kilogram chunk of ice that apparently fell from the sky．
spain and Italy area"the only European40 getting attacked by huge ice blocks in January On JaIluary 2 in Surrey，England(southwest of London)，an East Indian man was walkingthrough Newton Amletic Park when he41a strange whistling sound overhead．‘Seconds 42 ，a large hunk of ice fell out of the clear blue sky and pounded in‘to the soft ground，shattering over a 50 foot—wide area．The ice dug a hole of a foot deep and a foot in di锄eter． Even the shattered remnins of the mystery ice were as large as tennis balls and were described as opaque 43 no unusual color or smell． 
    Although eyewitnesses to the phenomenon report that they did not see anything in the sky that could account 44 the ice，scientists had to come up with a rationalization．Professor Jesus Mar tinez Frias，the geologist investigating the ice falls in Spain，told BBC News t}lat me ice Dieces had probably been 45through sudden temperature drops in the stratosphere．nlis was the most like1y explanation，he said，for the‘‘very unusual”phenomenon．

    If you are worried about things and are under a lot of stress at work or school，then you are probably not sleeping well．Worry can keep you awake，tossing and 26 in bed until the early hours of the morning when you eventually27asleep．When you wake up，you don’t feel 28，but tired and worn out and 29 to face a new day．
    Dr．Henry Winkle，in a recent newspaper article30 Stress and Sleep，31 that stress and lack of sleep are directly32．Dr．Winkle says，“the more we worry，the33 we sleep，the more we are unable to deal with34．”“If we can find a way to get a good night’S sleep，”he 35．“we can often find the36 to deal with what’S worrying US．”
    So,what is a good night’s sleep ? Research shows that the amount of sleep which people need in order to keep healthy37a lot．Seven hours is about the average amount，38strangely enough，sleeping longer often gives you a headache 39 0f making you feel more refreshed.
    Dr．Winkle believes that preparing for sleeping is important．People who work late should try to give themselves a short40and do something restful before going to bed．This could be watching TV or listening to music．Doing some exercise41in the day should help you to feel physically as well as42 tired．A bedtime drink Can also help，but coffee or tea should be avoided as they contain caffeine(咖啡因)and will keep you 43．“When you put the light 44，”Dr．Winkle says，“concentrate on relaxing your muscles．Working slowly up from your feet，and you’11 be asleep45 you know it．”
根据以上内容，回答题。

Many visitors to the United Kingdom go straight to London and never set foot outside the capital—which is a pity, for those that do are often surprised at the sheer variety of landscapes 1 within such a small geographical area. 2 you want to see stunning, unspoilt scenery you should 3 spend a few days in one of Britain"s largest areas of protected countryside, a national park. 4 in the second half of the 20 ^th century after popular pressure for access 5 the country"s wilder places, there are now 15 of them throughout the British Isles.
The biggest is the Cairngorms in northern Scotland, named 6 some of the country"s highest mountains and the best place for skiing. Pony-trekking, climbing and fishing are also 7 , along with Scotland"s national game, golf. 8 enthusiasts are well rewarded—this is the home of the red deer, red squirrel and golden eagle, If you don"t like the 9 to the highest point, some 2000 metres 10 sea level, you can take the railway 11 gets you to the summit in less than ten minutes. 12 the west of the park is another popular natural 13 , Loch Ness. The lake is over 200 metres 14 in places, and salmon, trout and eels are in abundance here.
Over the border in England is the Lake District, 15 made famous by Romantic poets such as William Wordsworth two hundreds years ago. People have been 16 here en masse since 1847 17 a railway was built to its biggest lake, Windermere. 18 in the past boats plied its waters 19 stone, timber and wood, today"s craft are more likely to carry 20 on pleasure cruises—over a million a year, in fact.

The two companies are going to {{U}}merge{{/U}} by the first month of the year.

After reading the novel he was too exciting to go to sleep that night.

It took years for Einstein"s theory to gain acceptably .

Cars turn into dead weapons when they are driven carelessly.

Have run out of fuel, the plane crashed to the ground.

回答题
    Eggs are my favorite food．I like them 21 ，hard-boiled，scrambled，or poached．I eat eggs for 22 ，lunch，and dinner．I eat eggs here，there，and everywhere!
    Eggs taste great．You can eat them by 23 or as part of any meal．Eggs are 24 used as an ingredient in many prepared foods．Can you think of any foods that contain 25 ?
    Eggs are really a perfect food．They are 26 in most of the nutrients we need to maintain good 27 ．When a baby chicken develops 28 an egg，the egg 29 and yolk are the only foods they need．
    Many people believe that eggs are 30 ．They point out that eggs contain a very high amount of cholesterol(胆固醇)．Too 31 of one kind of cholesterol in our blood can cause heart disease．
    There is no evidence that eggs 32 the harmful cholesterol in our blood．When we eat foods that are 33 in cholesterol，our bodies make 34 of it to balance，or adjust．
    If you want to enjoy a tasty and healthy food．eat plenty of 35

一个马尔可夫信源有3个符号{u 1，u 2，u 3}，转移概率为：p（u 1|u 1）=1/2，p（u 2|u 1）=1/2，p（u 3|u 1）=0，p（u 1|u 2）=1/3，p（u 2|u 2）=0，p（u 3|u 2）=2/3，p（u 1|u 3）=1/3，p（u 2|u 3）=2/3，p（u 3|u 3）=0，画出状态图并求出各符号稳态概率。