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Reading Comprehension

  A barn owl(猫头鹰) silently flies at night through the dark forest. Suddenly, the large bird hears a mouse running through the leaves. The bird quickly changes its flight path, drops down, and scoops up(抓起) the mouse in its talons(猛禽的爪). Another meal has been successfully captured.

  How is the barn owl able to pinpoint the location of the mouse in the dark? Credit(把…归功于) the bird' s excellent hearing and its ability to determine the exact location of the source of a sound.

  According to a recent study at Stanford University, a barn owl learned how to pinpoint the location of a sound source when it was only about two weeks old. The owl did this by noting the difference in the time it took a sound to reach each ear and in the difference in the loudness of the sound in each ear.

  In another test, three young barn owls were given eyeglasses when their eyes were just beginning to open. The lenses(镜片) in the glasses distorted(使变形) a scene so that an object an owl was looking at seemed to be 20 degrees to the left of its actual position.

  The scientists found that whenever one of the young owls heard a sound, it would look at a spot 20 degrees to the left of the sound source. Thus, the scientists concluded, the owls learned at a very young age how to locate the source of a sound.

1.What is the reason for the barn owl to successfully catch the mouse?

[  ]

A.It has very good eyesight at night.

B.It has very sharp hearing.

C.It is very good at determining the location of the sound.

D.Both B and C.

2.According to a recent study, a barn owl learned how to ________ when it was only about two weeks old.

[  ]

A.fly fast without sound

B.catch the mouse with its talon

C.locate the sound source

D.open its eyes wider

3.What do the words “to pinpoint the location” in the second paragraph mean?

[  ]

A.To find the exact position.

B.To notice the particular smell.

C.To recognize the real shape.

D.To hear the sound clearly.

4.Why did one of the young owls, after hearing a sound, look at a spot 20 degrees left of the sound source?

[  ]

A.It was too young to find the correct spot.

B.It was used to looking at the spot 20 degrees to the left of an object.

C.It was a mistake often made by this young owl.

D.It was wearing eyeglasses which distorted the object.

5.What is the main idea of the passage?

[  ]

A.How did the scientists train the owls to catch mice at night?

B.Why can eyeglasses help owls to catch mice?

C.Scientists used eyeglasses to make owls see better.

D.Why can owls catch mice at night?

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