大学英语四级分类模拟题493
(总分70,考试时间90分钟)buttons
Part Ⅰ Writing
1. For this part, you are allowed 30 minutes to write a short essay on Facing Setbacks in a Positive Way by referring to the saying "Life has to have cracks in it so that the sun can shine through." You can cite examples to illustrate your point and then explain how you can develop your ability to face failure properly. You should write at least 120 words but no more than 180 words.
Part Ⅱ Reading Comprehension
noblezaPassage One
Some fish can swim in water below 0℃, low enough to freeze the blood of most creatures. However, some fish and incts can stay alive in the freezing water. One key to survival is a
magic carpet ridespecial protein in the fish"s blood. The chemical is called the Antifreeze Protein, otherwi known as AFP and is commonly found in fish that live in cold waters.
What does AFP do in the fish? First, we need to understand what happens when water freezes. When the temperature of the water drops below-1.0℃, tiny particles of ice start forming in the water. Each particle becomes larger and then sticks to other particles, forming blocks of ice. Fish take in this water and tiny particles of ice also form inside a fish"s body. However, the AFP in the blood of the fish surrounds the particles, preventing them from sticking together to form bigger pieces of ice.
The application of AFP is promising. For example, AFP can be ud to alter the taste and texture of ice-cream. It can also be ud to store meat and vegetables more effectively by protecting food products from the formation of ice. Another application is in medical field, as AFP can help prerve organs for transplantation without freezing them. Scientists have known about AFP for more than 30 years, yet few of the technologies that u the AFP exist today. The process of getting the necessary amount of AFP from fish to make p
roducts was only recently discovered. **panies in the United States and Canada have already made products using AFP, but they have yet to become popular. Although some rearchers in Japan discovered that some local fish contained AFP and succeeded in creating AFP in the laboratory, more rearch is necessary. AFP tests will continue for the fish out of the water.
1. The Antifreeze Protein ______.高中牛津英语
A. is a kind of protein that many fish have stored in their bodies
B. is found in certain fish that live in extremely cold water
C. increas the freezing process of water in the ocean
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D. is the key to finding the location of fish in cold regions
2. How does AFP work?
A. It covers the small ice particles so that they remain parated from each other.
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B. It turns ice back into water by breaking down ice piece by piece.
C. It allows the fish to find places in the ocean that have warmer temperatures.
D. It forms a protective layer around the fish"s body, keeping it warmer.
3. Why is AFP not widely ud?
A. It is only found in the blood offish that lives in colder as.
B. The technology to utilize AFP has yet to be improved upon.
C. The protein will not be safe for another 30 years.
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D. Countries such as Canada and Japan want to do more rearch first.
4. What can AFP possibly do in the future?
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A. Make fresh fruits and vegetables taste better.
B. Protect dried meat from being damaged by ice.
C. Keep meat and vegetables from going bad.
D. Help doctors freeze organs for transplantation.
5. Which of the following statements is true?
A. AFP was discovered more than three centuries ago.
B. Few scientists are interested in continuing rearch on AFP.
C. AFP can rai the temperature of any liquid.
D. Scientists are thinking of a variety of ways to u AFP.
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Passage Two
ForgetBrother, Can You Spare a Dime?The theme song of this recession might well be"Mother, Can You Write a Check?"The distressing economy has resulted in increasing numbers of parents and grandparents helping out their strapped adult children and grand
kids with home down payments, credit-cardbailouts(紧急财政援助), and spare cash—often at the same time as parents are trying to confront new retirement budgets.
