题目内容
Nowadays, incoming generations really rely now on the power of the "Internet" when it comes to searching for information. Just type the word or phrase you're looking【C1】______ and click, there goes your answer. So why【C2】______ wasting time turning the pages of encyclopedias if in just a snap of a finger you have what you needed？ People underestimate the power of encyclopedias. Well, technically, all of them are【C3】______ sources which means, they are like the walls that can fully support your data. They are first hand accounts done by professionals and【C4】______ .
On the other hand, Internet information I'm not saying all of them, are【C5】______ secondary, or third hand sources【C6】______ basically means that they have been edited or【C7】______ .They maybe data collected from several sources and were put together. However, the problem here is the errors which the writer or the author【C8】______ . He/she may have different under standing on the data than you,【C9】______ you have actually seen the data. So it is like you're just a kid listening to other's story instead of you telling your own.【C10】______ from that, you're not 100% sure that the author is【C11】______ . He/she maybe just a kid posting and posting wrong ideas for【C12】______ .
What I would like to【C13】______ here is that manual research is still stronger than any other. There is freedom in it, freedom to give your【C14】______ , under standing, insights towards these first-based ideas. You also type your work【C15】______ gathering the data so you become more【C16】______ with it because writing is the last stage of learning since you make an output out of your【C17】______ . Unlike the one in the Internet, some people also tend to "copy-paste" their works【C18】______ ever reading them. So they don't absorb【C19】______ must be absorbed. As they say, "No Pain, No Gain", so working hard with your research will surely be a【C20】______ and a strong one.
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Monocular vision enables the kingfisher to
A bee finds its direction by
What made Angels and Demons sell well？
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 (视锥细胞) per square millimeter in its retina (视网膜). 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(凹窝)-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.
The Snellen eye chart measures one's eyesight by ______.
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