Question

As skies are filled with millions of migrating(遷徙)birds, European scientists say the seasonal wonder appears to be strange: The fatter the bird, the better it flies.
The results of their study led to a theory opposite to a central one of aerodynamics(空氣動力學(xué)), which says that the power needed to fly increases with weight.
For birds, obviously, the cost of flying with heavy fat is much smaller than we used to think. Researchers found that red knot wading birds double their normal body weight of 100 grams before making their twice-a-year nonstop flight between the British Isles and the Russian Arctic. Distance: 5, 000 kilometers.
Another study in the magazine Nature measured the advantage of flying in an aerodynamic group which allows birds to save energy by flying smoothly and quietly in the lead bird’s air stream.
Flying in groups, their heart rates were 14.5 percent lower than flying alone, according to Henri, a French scientist. The findings help explain how birds complete difficult migrations. Researchers had thought that thinner, stronger birds would have the best chance  to survive.
The first study suggests that building up fat to be burnt as fuel during the migration is worth more than the energy it takes to carry the additional weight.
In the study, researchers said their team studied the birds flown at different body weights during 28 simulated(模擬的)flights. They forced a small amount of special water into the birds’ bodies so that they could measure the amount of energy burnt during the flight.
60.A red knot wading bird of 100 grams will probably weigh_____before making its nonstop migrating flight.
A.50 grams             B.100 grams           C.150 grams             D.200 grams
61.During their migrating flight, red knot wading birds can save energy by flying_______.
A.separately        B.alone            C.in groups               D.in pairs
62.A_______red not wading bird has a better chance to survive during its migrating flight.
A.stronger       B.weaker         C.thinner                  D.fatter
63.The best title for this passage may probably be________.
A.Birds Thin Down For Journey               B.Birds Fatten Up For Journey
C.How Birds Build Up Fat For Journey       D.How Birds Burn Energy For Journey

Answer 1

60--63    DCDB  

60．解析：這是一道計算題。根據(jù)第三段中的Researchers found that red knot wading birds double their normal body weight of 100 grams before making their twice-a-year nonstop flight between the British Isles and the Russian Arctic.可計算出在進(jìn)行不停頓的遷徙飛行，一只red knot wading bird可能重200克。double their normal body weight of 100 grams表示“它們正常體重100克的兩倍”，即200克。
61．解析：這是一道細(xì)節(jié)題。第四段中的Another study in the magazine Nature measured the advantage of flying in an aerodynamic group which allows birds to save energy by flying smoothly and quietly in the lead bird’s air stream.說明red knot wading birds以一群鳥一起飛行的方式進(jìn)行飛行時能夠節(jié)省能量。
62．解析：這是一道細(xì)節(jié)題。從第五段中的Researchers had thought that thinner, stronger birds would have the best chance to survive.可以看出，比較肥胖的red knot wading birds在遷徙飛行中更有機(jī)會存活。句子的謂語是虛擬語氣，說明研究者原先認(rèn)為越瘦越強壯的red knot wading birds存活的機(jī)會越大，而實際情況與此相反。
63．解析：這是一道標(biāo)題選擇題。這篇短文報道了對red knot wading birds遷徙飛行的研究，研究表明因為red knot wading birds在遷徙過程中消耗大量能量，所以比較肥胖的red knot wading birds越有在遷徙飛行中存活的機(jī)會，因此這篇短文的題目應(yīng)是：Birds Fatten Up For Journey。