As skies are filled with millions of migrating(迁徙)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(空气动力学), 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(模拟的)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

As I walked home one freezing day, I stumbled(绊脚) on a wallet in the street. I picked it up and looked inside to find some   21  so that I could call the owner. But the wallet   22  only three dollars and a letter, which looked as if it had been in there for years. The envelope was   23   and the only thing on it was the return address. I started to open the letter,   24  to find some clue. Then I saw the dateline－1924. The letter had been written almost sixty years earlier! It was written in a beautiful handwriting, on blue paper with a little flower in the left-hand corner. It was a “Dear John”(绝交) letter that told the   25  , Michael, that the writer could not see him any more because her mother   26   it. Even so, she wrote that she would  27   love him. It was signed Hannah.

It was a beautiful letter, but there was no   28  , except for the name Michael, to identify the owner.   29   if I called the information center, the operator could find a phone listing for the address on the envelope. Actually, I took great   30   to find both Hannah and Michael, who still remained single. Then, after sixty years’ separation, they married each other in their late seventies. And I was invited to be their best man!

21．A．identification          B．qualification            C．recognition             D．description

22．A．cost                       B．filled                      C．contained         D．included

23．A．new                       B．worn                      C．pretty                     D．attractive

24．A．managing               B．wondering              C．supposing               D．hoping

25．A．receiver                  B．owner                     C．friend                     D．partner

26．A．allowed                  B．forced                    C．forbade                   D．promised

27．A．ever                       B．never               C．always                    D．even

28．A．problem                 B．way                        C．mark                      D．sign

29．A．Only                      B．Even                      C．As                          D．Maybe

30．A．pains                      B．risks                       C．actions                    D．cautions

  As skies are filled with millions of migrating(迁徙) birds, European scientists say the seasonal wonder appears to be strange: The fatter the bird, tile better it flies.

    The results of their study led to a theory opposite to a central one of aerodynamics (空气动力学), 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(模拟的) 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 knot 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 ________.

Birds Thin Down For Journey

Birds Fatten Up For Journey

How Birds Build Up Fat For Journey

How Birds Burn Energy For Journey

As a physician who travels quite a lot, I spend a lot of time on planes listening for that dreaded “Is there a doctor on board?” announcement. I’ve been   16  only once — for a woman who had merely fainted. But the   17  made me quite curious about how   18  this kind of thing happens. I wondered what I would do if   19  with a real midair medical emergency — without access   20  a hospital staff and the usual emergency equipment. So   21  the New England Journal of Medicine last week   22  a study about in-flight medical events, I read it   23  interest.
　　The study estimated that there are a(n)   24  of 30 in-flight medical emergencies on U.S. flights every day. Most of them are not   25 ; fainting and dizziness are the most frequent complaints.  26  13% of them — roughly four a day — are serious enough to   27  a pilot to change course. The most common of the serious emergencies   28  heart trouble, strokes, and difficulty breathing.
　　Let’s face it: plane rides are   29 . For starters, cabin pressures at high altitudes are set at roughly      30  they would be if you lived at 5,000 to 8,000 feet above sea level. Most people can tolerate these pressures pretty   31 , but passengers with heart disease   32  experience chest pains as a result of the reduced amount of oxygen flowing through their blood.   33  common in-flight problem is deep venous thrombosis — the so-called economy class syndrome (综合症).   34  happens, don’t panic. Things are getting better on the in-flight-emergency front. Thanks to more recent legislation (立法), flights with at      35  one attendant are starting to install emergency medical kits to treat heart attacks.

As I held my father’s hands one night, I couldn’t help but notice their calluses (老茧) and roughness. His hands tell the story of his life as a    16  , including all his struggles.
One summer, I remember, a drought (旱灾) hit Ontario, turning it into a   17   desert. On one of those hot mornings I was picking sweet corn with my dad to fill the last  18  from the grocery shore. Fifty dozen was all we needed, which  19   took twenty minutes. That morning, however, the process didn’t   20  quickly. After forty minutes of aimlessly walking in the field, we    21   needed twenty dozen. I was completely frustrated and    22   . Dropping the basket heavily, I declared, “If the store wants its last twenty dozen, they can pick it themselves!” Dad    23   , “Just think, my little girl, only ten dozen left for each of us and then we’re    24   . ” Such is Dad—whatever problem he    25   , he never gives up.
   26   , the disastrous effects of the drought were felt all over our country. It was a challenging time for everyone,   27   Dad remained optimistic. He    28   to be grateful for other things like good health and food on our plates. Only then did I truly begin to    29   Dad and his faith guided us through the hard times.
Dad is also a living example of real    30  . From dawn to dark, he works countless hours to    31   our family. He always puts our happiness    32   his own, and never fails to cheer me on at my sports games    33   his exhaustion after long days. His loving and selfless nature has inspired me to become more sympathetic and    34  , putting others first.
Dad, the life    35   I have learned from you will stay with me forever. You are my father, teacher, friend and, most importantly, my hero.