C. rods
D. spectrum
3. The retina send pulses to the brain ___.
A. in short wavelengths
B. as color pictures
C. by a ganglion cell
D. along the optic nerve.
4. Twenty-four still photographs are made into a continuous moving picture just because ___.
A. the image we see usually stays longer than it actually appears.
B. we see an object in comparison with its surroundings.
C. the eyes catch million pieces of information continuously.
D. rods and cones send messages 20 to 25 times a second.
5. The authors purpose in writing the passage lies in ___.
A. showing that we sometimes are deceived by our own eyes.
B. informing us about the different functions of the eye organs.
C. regretting that we are too slow in the study of eyes.
D. marveling at the great work done by the retina.
参考答案:
CADAB
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