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新东方考研英语小作文： vision

Human vision like that of other primates has evolved in an arboreal environment. In the dense complex world of a tropical forest, it is more important to see well that to develop an acute sense of smell. In the course of evolution members of the primate line have acquired large eyes while the snout has shrunk to give the eye an unimpeded view. Of mammals only humans and some primates enjoy color vision. The red flag is black to the bull. Horses live in a monochrome world .light visible to human eyes however occupies only a very narrow band in the whole electromagnetic spectrum. Ultraviolet rays are invisible to humans though ants and honeybees are sensitive to them. Humans though ants and honeybees are sensitive to them. Humans have no direct perception of infrared rays unlike the rattlesnake which has receptors tuned into wavelengths longer than 0.7 micron. The world would look eerily different if human eyes were sensitive to infrared radiation. Then instead of the darkness of night, we would be able to move easily in a strange shadowless world where objects glowed with varying degrees of intensity. But human eyes excel in other ways. They are in fact remarkably discerning in color gradation. The color sensitivity of normal human vision is rarely surpassed even by sophisticated technical devices.

新东方考研英语小作文：Cells and Temperature

Cells cannot remain alive outside certain limits of temperature and much narrower limits mark the boundaries of effective functioning. Enzyme systems of mammals and birds are most efficient only within a narrow range around 37C;a departure of a few degrees from this value seriously impairs their functioning. Even though cells can survive wider fluctuations the integrated actions of bodily systems are impaired. Other animals have a wider tolerance for changes of bodily temperature.

For centuries it has been recognized that mammals and birds differ from other animals in the way they regulate body temperature. Ways of characterizing the difference have become more accurate and meaningful over time, but popular terminology still reflects the old division into “warm-blooded” and “cold-blooded” species; warm-blooded included mammals and birds whereas all other creatures were considered cold- blooded. As more species were studied, it became evident that this classification was inadequate. A fence lizard or a desert iguana-each cold-blooded----usually has a body temperature only a degree or two below that of humans and so is not cold. Therefore the next distinction was made between animals that maintain a constant body temperature, called home0therms, and those whose body temperature varies with their environments, called poikilotherms. But this classification also proved inadequate, because among mammals there are many that vary their body temperatures during hibernation. Furthermore, many invertebrates that live in the depths of the ocean never experience change in the depths of the ocean never experience change in the chill of the deep water, and their body temperatures remain constant.

新东方考研英语小作文：爱心

Love is of utmost importance to us humans. Everybody not only needs love, but also should give others love. As can be seen from the picture, "love is a lamp which is brighter in darker places. " This is indeed true. People in darker places need more light than other people. Maybe even a dim light can give them much hope for a better life. Maybe just a thread of light will call forth their strength and courage to help them step out of their difficulties.

I can think of no better illustration of this idea than the following example(s).For instance when someone is starving to death, just a little food and water from you may save his(her) life. Again, when a little girl in a poor rural area drops out of school because of poverty, just a small sum of money from you may support her to finish school and change her life. In these case/circumstances you have given love which is like a lamp in a dark place where light is most needed.

To sum up, we should offer our help to all the needed. We expect to get love from others and we also give love to others. So when you see someone in difficulty or in distress and in need of help, don"t hesitate to give your love to him (her). I believe that the relationship between people will be harmonious and that our society will be a better place for us to live in.