摘要：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 答案 60.D 61.C 62.D 63.B Passage 67 The coyote.that elever animal of wide-open space .has come to the nation’s captial.In fact ,coyotes have spread to every comer of the United States,changing their behaviors to fit new envioronments and causing researchers to deal with a troublesome new kind of creature:the city coyote. The coyote originally lived in the middle of the continent.One of its most obvious characters is its smartness, which has made the animal a notoriouspest.Hunters trapped,shot and poisoned more than a million coyotes in the 1900s.It’s still one of America’s mosthunted animals. Yet the coyote has survived.How has the coyote shown this extraordinary ability? I guess if you wanted to use one word,it’d be `plasticity’. says Erie Gese,an expert at Utah State University. Coyotes can live alon, in pairs, or in large packs like wolves,hunt at night or during the day , occupy a small region or an area up to 40 square miles,and live on all sorts of food,from lizardsand shoes, to ants and melons. Unbelicvadly people helpcd coyotes increase when they kiltcd most of the wolves in the United States. The sprcdding of coyotes into city areas,though.is rccent.They travel at night,crossing sidcwalks and bridges.running atong roads and ducking into cuinerts and underpasscs .No one knows why coyotes are maving into cities.but expertsexplaih that clevcter,more human-tolerantcoyotes are teaching urban survivalskills to new generations. Occasionally.coyotes mighe attack human beings.There have been about 160 attacks on peoplc in reccnt years Therefore,people have bccn consistently told not feed coyotes or leave pct food unseeurcd.That ,plus a large trapping program in the neighborhood.has cur down on the coyote population.

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As skies are filled with millions of migrating 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.

1．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

2．A ________ red knot wading bird has a better chance to survive during its migrating flight.

      A．stronger          B．weaker           C．thinner           D．fatter

3．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

 查看习题详情和答案>>

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 say that the power needed to fly increased 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 bakes 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.

1. 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

2. During their migrating flight, red knot wading birds can save energy by flying _______.

A. separately　　 B. alone　　　　 C. in groups 　 D. in pairs

3. A _______ red knot wading bird has a better chance to survive during its migrating flight.

A. stronger　　　 B. weaker　　　 C. thinner　　 D. fatter

4. 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

 

 查看习题详情和答案>>

 

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 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 take 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.

1.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

2.During their migrating flight, red knot wading birds can save energy by flying________.

   A. separately         B. alone             C. in groups        D. in pairs

3.A ________red knot wading bird has a better chance to survive during its migrating flight.

  A. stronger            B. weaker            C. thinner         D. fatter

4.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

 

 查看习题详情和答案>>
阅读理解。
     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.
1. 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
2. During their migrating flight, red knot wading birds can save energy by flying _____. 
A. separately
B. alone
C. in groups
D. in pairs
3. A ______ red knot wading bird has a better chance to survive during its migrating flight.
A. stronger
B. weaker
C. thinner
D. fatter
4. 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
查看习题详情和答案>>

　　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.

(1) 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

(2) During their migrating flight, red knot wading birds can save energy by flying________.

[　　]

A．separately

B．alone

C．in groups

D．in pairs

(3) A _______ red knot wading bird has a better chance to survive during its migrating flight.

[　　]

A．stronger

B．weaker

C．thinner

D．fatter

(4) 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

 查看习题详情和答案>>

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