Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. The human criterion for perfect vision is 20/20 for reading the standard lines on a Snellen eye chart without a hitch. The score is determined by how well you read lines of letters of different sizes from 20 feet away. But being able to read the bottom line on the eye chart does not approximate perfection as far as other species are concerned. Most birds ...
Tôi yêu Việt Nam | Chat Online | |
02/09 11:05:15 (Tiếng Anh - Lớp 12) |
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
The human criterion for perfect vision is 20/20 for reading the standard lines on a Snellen eye chart without a hitch. The score is determined by how well you read lines of letters of different sizes from 20 feet away. But being able to read the bottom line on the eye chart does not approximate perfection as far as other species are concerned. Most birds would consider us very visually handicapped. The hawk, for instance, has such sharp eyes that it can spot a dime on the sidewalk while perched on top of the Empire State Building.
It can make fine visual distinctions because it is blessed with one million cones per square millimeter in its retina. And in water, humans are farsighted, while the kingfisher, swooping down to spear fish, can see well in both the air and water because it is endowed with two foveae - areas of the eye, consisting mostly of cones, that provide visual distinctions. One fovea permits the bird, while in the air, to scan the water below with one eye at a time. This is called monocular vision. Once it hits the water, the other fovea joins in, allowing the kingfisher to focus both eyes, like binoculars, on its prey at the same time.
A frog’s vision is distinguished by its ability to perceive things as a constant motion picture. Known as “bug detectors”, a highly developed set of cells in a frog’s eyes responds mainly to moving objects. So, it is said that a frog sitting in a field of dead bugs wouldn’t see them as food and would starve. The bee has a “compound” eye, which is used for navigation. It has 15,000 facets that divide what it sees into a pattern of dots, or mosaic. With this kind of vision, the bee sees the sun only as a single dot, a constant point of
reference. Thus, the eye is a superb navigational instrument that constantly measures the angle of its line of flight in relation to the sun. A bee’s eye also gauges flight speed. And if that is not enough to leave our 20/20 “perfect vision” paling into insignificance, the bee is capable of seeing something we can’t - ultraviolet light.
Thus, what humans consider to be “perfect vision” is in fact rather limited when we look at other species. However, there is still much to be said for the human eye. Of all the mammals, only humans and some primates can enjoy the pleasures of color vision.
According to the passage, why might birds and animals consider humans very visually handicapped?
Lựa chọn một trả lời để xem Đáp án chính xác Báo sai đáp án hoặc câu hỏi |
A. Humans can’t see very well in either air or water. 0 % | 0 phiếu |
B. Human eyes are not as well suited to our needs. 0 % | 0 phiếu |
C. The main outstanding feature of human eyes is color vision. | 1 phiếu (100%) |
D. Human eyes can’t do what their eyes can do. 0 % | 0 phiếu |
Tổng cộng: | 1 trả lời |
Trắc nghiệm liên quan
- Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. The human criterion for perfect vision is 20/20 for reading the standard lines on a Snellen eye chart without ... (Tiếng Anh - Lớp 12)
- Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. The human criterion for perfect vision is 20/20 for reading the standard lines on a Snellen eye chart without ... (Tiếng Anh - Lớp 12)
- Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. The basic elements(A) of public-opinion research are(B) interviewers, questionnaires, tabulating ... (Tiếng Anh - Lớp 12)
- Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. Abraham Lincoln's boyhood home (A) resembled that (B) of many other mid-western pioneers, with its dirt ... (Tiếng Anh - Lớp 12)
- Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. Man(A) is superior than(B) the animals in that(C) he uses language to communicate(D). (Tiếng Anh - Lớp 12)
- Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. After ancient Greek athletes won a race in the Olympic, they __________ a simple crown of olive leaves. (Tiếng Anh - Lớp 12)
- Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. I don’t object to people being vegetarians, but it gets on my nerves when they’re ________ about it. (Tiếng Anh - Lớp 12)
- Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. You should ___________ at least three days for the journey. (Tiếng Anh - Lớp 12)
- Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. In order to avoid boredom, the most important thing is to keep oneself ___________. (Tiếng Anh - Lớp 12)
- Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. The move to a different environment brought about a significant _______ in my cousin’s state of mind. (Tiếng Anh - Lớp 12)
Trắc nghiệm mới nhất
- Read the following passage and choose the letter A, B, C, or D to fill in each of the numbered blanks. (1.25pts) English has been called (26)________ international language for more than a century. The number of people (27) ________ speak English as ... (Tiếng Anh - Lớp 10)
- We live in a mountain area in the north-west of the country in Viet Nam. (Tiếng Anh - Lớp 10)
- Billy enjoys dance but his parents are making him join the school football team. (Tiếng Anh - Lớp 10)
- Choose the letter A, B, C, or D that needs correction in each of the following questions. (0.75pt) Chemistry are considered as a difficult subject by many students. (Tiếng Anh - Lớp 10)
- The weather is nice and my friend will go to her farm to pick strawberries. (Tiếng Anh - Lớp 10)
- Choose the letter A, B, C, or D which is closest in meaning to each of the following questions. (0.5pt) My children have carried the chairs into the house. (Tiếng Anh - Lớp 10)
- Many young people move to big cities to _______ a good career. (Tiếng Anh - Lớp 10)
- We are going to spend our holiday _______ rural England. (Tiếng Anh - Lớp 10)
- Mary said that she _______ go shopping with me. (Tiếng Anh - Lớp 10)
- I and my younger sister _______ English since we were in grade 3. (Tiếng Anh - Lớp 10)