一道英语完型填空BirdsusetheirrighteyetoseetheEarth’smagneticfield（磁场）anduseittonavigate（导航）,scientistshavediscovered.Germanresearchersfoundthatifabird’srighteyewascovered,itcouldnotnavigateeff

Question

一道英语完型填空
Birds use their right eye to see the Earth’s magnetic field（磁场）and use it to navigate（导航）,scientists have discovered.
German researchers found that if a bird’s right eye was covered,it could not navigate effectively,while it could navigate perfectly well if the left eye was covered instead.
It has long been known that birds are able to sense magnetic fields and use them to navigate,particularly when migrating south for the winter.Now researchers have found that the bird actually sees the magnetic fields with their right eye giving information to the left side of their brain.
The magnetic images create light or dark shadings over what the bird usually sees with its normal vision.The shadings change as the bird turns its head,giving it a visual compass from the patterns of shading.
Scientists believe that the birds have molecules in their retina（视网膜）which shift into an active state when struck by blue light and that activity is picked up by the retina.To test the theories,scientists fitted robins（知更鸟）with goggles that were covered with clear foil（箔片）on one side and frosted foil on the other.
Both sides of the goggles were equally translucent（半透明的）,allowing 70 percent of the light to get through,but on the frosted side the image was less clear.The birds were then kept in cages until it was time for them to migrate.
The birds were released into a funnel-shaped cage with its walls painted with fluid,which was scratched if the birds touched them.
The results were that birds with no eye coverings,and birds with the left eye covered set off in a northerly direction as expected,while those with the right eye covered were at a loss and headed in random directions.
64.What can we know about birds from the passage?
A.Birds navigate by seeing the Earth’s magnetic field with their eyes.
B.Birds navigate by sensing the Earth’s magnetic field.
C.Birds navigate by seeing the Earth’s magnetic field with their right eye.
D.Birds can not navigate effectively with third paragraph mean?
65.What does the underlined word in the third paragraph mean?
A.flying to B.getting to C.reaching D.living
66.Birds can see the Earth’s magnetic field because of the following reasons EXCEPT________.
A.the special molecules in their retina
B.the fields appear as patterns of light and shading,or even color,over what they normally see
C.information is given to the left side of their brain
D.birds turn their heads to shift into an active state
67.Which field can the research result be used?
A.Birds protection.B.Detective.C.Medicine.D.Space flight.

Answer 1

C D D
第三段中哪一个字是划线的字呢?