By writing Paragraph 1, the author intends to______.
A. advocate that pet animals do as well have traits
B. prove that little attention has been paid to the personalities of animals
C. introduce a study focusing on birds" behaviors
D. state that people differ from animals because of personalities
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The Visx machine determines how accurately the eye______.
A. can see distance
B. is able to read eye charts
C. bends the light
D. is working
The authors attitude towards the Visx machine is that______.
A. it is interesting but not very useful
B. he says it"s a wonderful invention which could replace eye charts
C. it can be useful but he thinks it"s too early to make a switch
D. too much time and money have been wasted on it
When the retina reflects the beams, what occurs？
A. Patients have trouble seeing.
B. The ability to focus is gone.
C. No correction is needed.
D. The lens bends the light beams.
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