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A) the number of lines he reads
B) the distance he stands away from the chart
C) the speed at which he recognizes the letters
D) several integrative factors
2. How is hawk's eyesight better than ours?
A) It can identify small items more quickly than we do.B) It can see ai a longer distance than we do.
C) It has more cones in che retina than we do.
D) It has bigger eyes than we do.
3. Monocular vision enables the kingfisher to__________________.
A) avoid farsightednessB) be able to see underwater
C) move one eye at a time
D) focus its eyes on the prey
4. A bee finds its direction by_______________________.
A) dividing what it sees into thousands of dotsB) constantly gauging its flying speed
C) using the sun as a constant point of reference
D) measuring the angle of the sun
5. What is the main idea of the passage'?
A) The differences between human eyes and other species' eyes.B) The advantages of other species' eyes in comparison with human eyes.
C) The factors that make other species' eyes better than human eyes.
D) The standard that determines me "perfect vision” of human eyes.
