大学英语六级听力练习 013（在线收听）

Dictation Instructions

Listen to the following passage or together the passage will be read to you four times. During the first reading which will be read in normal speed .Listen and try to understand the meaning . For the second and third readings the passage will be read sentence by sentence or phrase by phrase. with intervals or 15 seconds. The last reading will be read in normal speed again and during this time you should take your work you will then be given 2 minutes to check your work once more. Please write the whole passage on answer sheet II 

Now listen to the passage.

pigeons

There are thousand of pigeons in any big city in the world. But did you know that these common birds is able to find its way home from even hundreds of kilometers away? Just how pigeons find their way home is a bit of mystery. Some people think that they use landmarks that is the pigeon knows what the land is like from the air and it uses this like a map. A landmark in Sydeny for example, is the Opera House, which can easily be seen from a long way off. Other possibilities are that pigeon use the position of the sun to work out directions or that they have some kind of built in compass. For quite a few years now scientists have been caring out experiement on homing pigeons but they still aren't to sure how pigeons find their way home. It seems likely however that pigeons like airline pilot use a number of different message to guide them on their long distance journeys. Perhaps, one day we'll learn their secret.