(1)The pin-point accuracy with which swallows return each spring to their old nests can only come about if the birds can recognize the areas where their nests are. A bird with its sharp eyesight certainly uses landmarks to guide it over the last few miles of its journey. Homing pigeons released up to twelve miles from their loft return by following landmarks which they have learnt as they ply around the area. Many birds are capable of something even more remarkable. They can get home even when high winds or long journeys in search of food take them far from the places they know. To return home they must, somehow, work out exactly where they are and which way to go.(2)The skill with which they do this has often been demonstrated by homing pigeons. But the longest journeys have been made by ocean birds. A Manx ocean bird, taken to Boston, USA, covered 3050 miles back to its nest in Wales in twelve days; and a Laysan albatross flew 4120 miles from the Philippines to its nest in the mid-Pacific.(3)Many theories h
From this passage, we can conclude that __________.
- A、the author’s personal experiences added to his belief in the theory mentioned in the last paragraph
- B、Philippine birds can return to their nests within 32 days
- C、the author may agree that birds find their way home with the help of the sun and stars, as well as their memory
- D、most theories on this subject have been proved wrong.
正确答案:C
答案解析:有
When would homing birds stop flying according to one explanation?
- A、When the things they see are the same as what they have remembered.
- B、When they meet the sun and stars with which they are familiar.
- C、When they are told to stop.
- D、When they reach their old nests.
正确答案:A
答案解析:有
The underlined word “this” (Para. 2) refers to __________.
- A、the remarkable ability of birds to find food
- B、the remarkable ability of birds to fly long distance
- C、the remarkable ability of birds to recognize old nests
- D、the remarkable ability of birds to return home
正确答案:D
答案解析:有
Which of the following statements is TRUE according to the passage?
- A、Birds learnt from ancient sailors the way to find the right directly.
- B、A bird finds its way home merely by landmarks.
- C、A bird finds its way home only by sharp eyesight.
- D、A bird finds its way home probably by the sun and stars.
正确答案:D
答案解析:有
According to the passage, ___________ may make the longest journey.
- A、swallows
- B、sparrows
- C、seagulls
- D、pigeons
正确答案:C
答案解析:有
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