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Directions: Read the passage carefully. Then answer the questions or complete the statements in NO MORE THAN 25 WORDS.
As skies fill with millions of migrating birds, European scientists say the seasonal miracle appears to depend on a seeming contradiction: The fatter the bird, the more efficiently it flies. The results of their study contradict a central theory of aerodynamics(空气动力学), which predicts that the power needed to fly increases with weight.
For birds, apparently, the cost of flying with heavy fuel loads is considerably smaller than previously thought. Researchers found that red knot wading birds double their normal body weight of 100 grams before making their twice-a-year, nonstop commute between the British Isles and the Russian Arctic. Distance: 5,000 kilometres.
Another study in the journal Nature measured the benefits of flying in an aerodynamic V formation, which allows birds to save energy by gliding in the lead bird’s air stream.
Flying in formation, their heart rates were as much as 14.5 per cent lower than flying solo, according to Henri Wimerskirch, a French scientist. The findings help explain how birds complete difficult migrations. Researchers had assumed that thinner, more athletic birds would have the best chance of survival.
The first study suggests that building up fat deposits to be burned as fuel during the migration is worth more than the energy it takes to carry the additional weight. Heavier birds apparently use their muscles more efficiently.
In the study, researchers said their team studied the birds flown at different body masses during 28 simulated flights. They were injected with a small amount of water containing a radioactive element that enabled the team to measure the amount of energy burned.
85. How much will a red knot wading bird probably weigh before making its nonstop migrating flight?
86. The additional weight gained before the flight won’t increase the powered needed to fly; on the contrary, it works as _____________________.
87. How did scientists successfully conduct the first study?
88. We can infer from the studies on fat deposits and V formation flying that both factors _____________________________.
85. 200 grams        
86. fuel to be burned during the migration 
87. By injecting birds with water containing a radioactive element and testing their different body masses during the flight.
88. Both factors work jointly and help birds fly efficiently and survive the tough long distance.
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C
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科目:高中英语 来源:不详 题型:阅读理解


C
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in the prison workplace.
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科目:高中英语 来源:不详 题型:完形填空


第二节(共5小题;每小题2分,共10分)
根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
If you walk into W. Lloyd Jerome’s dental surgery(手术) in Glasgow, you’ll see bright paintings and a fashionable blue couch which patients sit on while he checks their teeth. Jerome says, ‘That’s because they’re frightened.’
71   ‘That’s why I don’t wear a white coat. I find that’s one of the things that people associate with pain. In fact, my philosophy is that dental treatment should take place in an atmosphere of relaxation, interest and, above all , enjoyment.’
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At that moment, a patient arrives. Jerome rushes over, offers him a cup of tea, askes him what video he’d like to watch and leads him gently towards the chair.
A.Five years ago, Jerome went to the United States to do research.
B.He has tried to create an environment where people are not afraid.
C.The relaxation techniques are important but the quality of the treatment is the most important thing.
D.We were the first practice in Britain to introduce them.
E. Now they look forward to their visits here.
F. That dental smell of surgical spirit can get the heart racing in minutes if you’re frightened of dentists.
G. Fifty percent of the population only go to the dentist when they’re in pain.

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