专八：改错模拟题.pdf

模拟1

You stare at a waterfall for a minute or two, then shift your gaze to its surrounding. What you now see appears to drift upward. You __1

are board a train in a busy station when suddenly another train next __2

to your starts moving forward. __3

For a fraction of a second you feel that your train has lurched backward. These optical illusions occur because the brain is constantly matching its model of reality to signals from the body’s sensors and interpret what must be happening – that your train __4

might have moved, not the other; that downward motion is now __5

normal, so a change from it must be perceived as upward motion.

The sensors that make this magic are two kinds. __6

Each eye contains about 120 million rods, which provide somewhat blurry black and white vision. These are the windows of night vision; once adapted to the dark, they can detect a candle burnt __7

ten miles away. Colorful vision in each eye comes from six to seven __8

million structures called cones. Under ideal conditions, every cone can “see” the entire rainbow spectrum of visible colors, but one type of cone is most sensitive to red, another to green, the third to __9

blue. By monitoring how many wavelength of light affects the different cones, a connected ganglion cell can determ ine its “color” and relay that data. Rods and cones send their messages pulsing on __10

average 20 to 25 times per second along the optic nerve.

模拟2

The violence within a society is controlled through institutions of law. The most developed a legal system becomes, the more __1

societies takes responsibility for the discovery, control, and punishment __2

of violent acts. In most tribal societies the only means to dealing with __3

an act of violence is revenge. Each family group may have the responsibility for personal carrying out judgment and punishment __4

upon the person who did the offense. __5

But in legal systems, the responsibility for revenge becomes personalized and diffused. The society assumes the responsibility for __6

protecting individuals from violence. In cases where he cannot be __7

protected, the society is responsible for committing punishment. __8

In a state controlling legal system, individuals are removed __9

from the circle of revenge motivated by acts of violence, and the __10

state assumes responsibility for their protection.

模拟3

There are three main groups of oils: animal, vegetable and mineral.

Great numbers of animal oil come from whales, those enormous __1

creatures of the sea which are the largest remaining animals in the world. To protect the whale from the cold of the Arctic seas, nature has provided it with a thick cover of fat called blubber. When the __2

whale is killed, the blubber is stripped off and boiled down, either board the ship or on shore. It produces a great quantity of oil which __3

can be made into food for human consumption. A few other creatures yield oil, and none so much as the whale. The livers of the cod and __4

the halibut, two kinds of fish, yield nourishing oil. Both cod liver oil and halibut liver oil are given to sick children and other invalids who need certain vitamins. These oils may be bought at any chemist. Vegetable oil has been known from antiquity. __5

No household can not get on without it, for it is used in cooking. To __6

the ordinary man, one kind of oil may be as important as another.

But when the politician or the engineer refers to oil, one almost always __7

means mineral oil, the oil that drives tanks, aeroplanes and warships,motor-cars and diesel locomotives; the oil that is used to lubricate all kinds of machineries. This is the oil that has changed the life __8

of the common men. To it we owe the existence of the motor-car, __9

which has replaced the private horse-drawing carriage. __10

模拟4

Dinosaurs, saber-tooth tigers and the dodo bird are famous examples __1

of animals that have become extinct. In case of the dinosaurs, it __2

seems likely that a catastrophic event alters the global climate __3

enough to lead to their disappearance. More recent extinctions and near-extinctions－such as the blue whales, tiger, panda, and __4

North American bison—have been the direct result of human activity. By the early 1990s, species were becoming extinct at a rate of three per hour, or 27,000 every day – a figure quoted by the American biologist Edward O.Wilson of Harvard University, based on his most conservative estimates. This rate of extinctions carries with it some terrible consequences. Each plant that becomes extinct,for example, may take with it as much as 30 insects and animals __5

that depend on it for food. Habitat loss is one of the most important causes of extinction. For rising populations in many countries __6

lead to the clearing of more land, habitats such as raining forest __7

and grasslands disappear.

In the East Africa, once renowned for its wildlife, few wild animals __8

remain living outside the boundaries of national parks and game __9

reserves. In other parts of the world, coastal ecosystems are clearing __10

for development. Wetland areas are drying out as a result of water extraction to support farming and tourism. Bird species are among the worst affected by the loss of wetlands.