题目内容
Fishes are expected to be reduced in size by up to 24% because of global warming, say scientists.
Scientists believe that global warming has a greater effect on marine ecosystems (海洋生态系统) than previously thought. Previous researches have suggested that increasing ocean temperatures would affect both the distribution and the reproductive abilities of fishes. Now scientists believe that fish size would also be heavily affected.
Researchers built a model to see how fishes would react to the lower level of oxygen in water. Ocean temperatures increase and so do the body temperatures of fishes. But, according to the leading scientist Dr William Cheung, the lower level of oxygen in water is the key. Warmer waters could reduce the ocean oxygen level and greatly reduce fishes’ body weight. On the other hand, rising temperature directly increase the metabolic (新陈代谢的) rate of fishes’ body function. This leads to an increase in oxygen demand for normal body activities. So fishes will run out of oxygen for growth at a smaller body size.
The research group also used its model to predict fishes’ movements as a result of warming waters. The group believes that most fishes’ populations will move towards the Earth’s poles at a rate of up to 3.3 km per year.
Taking these factors into consideration, the research team concludes that fishes’ body size will be reduced by between 14% and 24%, with the largest reduction in the Indian and Atlantic Oceans.
When compared with the actual study of fish size, the model seems to make a lower judgment of what’s actually happening in the seas. The researchers made actual studies on some kinds of fishes living in the Atlantic Ocean. They found that the recorded data on these fishes showed greater reduction in body size than the models had predicted.
Scientists believe smaller-sized fishes could seriously affect the ability of fishes to reproduce (繁殖). Dr Alan Baudron, from the University of Aberdeen, the UK, thinks that smaller fishes produce fewer and smaller eggs and it could affect the reproductive potential of fishes.
68. From Paragraph 2 we can know that ________.
A. scientists have made two researches on the influence of global warming by now.
B. researchers suggest that the ocean temperature is increasing at a high rate.
C. researches suggest that global warming would change fishes’ inner structure
D. scientists have known three aspects of the influence that global warming has on fishes
69. Which is the most important factor that makes fishes smaller?
A. Higher body temperatures of fishes.
B. Lower oxygen level in water.
C. Slower heart beats of fishes.
D. Higher pressure in water.
70. According to the group, in 30 years, most fish populations will move about ________.
A. 30 kilometers B. 60 kilometers
C. 100 kilometers D. 200 kilometers
71. Which of the following in the best title for the passage?
A. Climate change may make fishes smaller.
B. Global warming has a bad effect on fishes.
C. Global warming affects the distribution of fishes.
D. Climate change may affect the ability of fishes to reproduce.
DBCA
阅读快车系列答案| 从下列方框中选适当的词或短语填空，注意其形式变化。 | |
2. Even if they speak different dialects, they have little difficulty ____ with each other. 3. Many kinds of fishes are fast disappearing ____ serious pollution. 4. I'm afraid something urgent has ____. I won't be able to see you tonight. 5. It's more useful to learn modern languages, ____ English and German, than Latin. 6. There is an atmosphere of peace and calm in the country, quite ____ that of a big city. 7. I can't attend the meeting, so Mr. Green will go ____ me. 8. TVs, radios, and newspapers ____ influencing people's opinions. 9. ____, we were left waiting in the rain for two hours. 10. In order to save resources, they are trying to ____ energy from the sun and wind. |
| 完形填空。 | ||||
| In the past, man did not have to think about the protection of his environment. There were few people on the earth, and natural resources seemed to be 1 . Today things are 2 , the world has become too 3 . We are using up our natural resources too quickly and at the same time we are 4 our environment with dangerous chemicals (化学制品). If we continue to do this, human life on the earth 5 survive. Everyone 6 today that if too many fishes are taken from the sea, there will soon be none left. Yet, with modern fishing 7 , more and more fishes are caught.We know that if too many trees are cut down, 8 will disappear and nothing will grow on the earth. Yet we 9 to use bigger and more powerful machines to 10 more and more trees. We realize that if rivers are polluted with waste products from factories, fish will die. 11 , in most countries wastes are 12 put into rivers or into the sea, and there are 13 laws to stop this. We know, too, that if the 14 of the world continues to rise at the present rate, in a few years there will not be enough 15 . What can we do to solve these problems? If we eat more vegetables and less 16 , there will be more food available (可用的) for everyone.Land that is used to grow crops 17 five times more people than land where animals are kept. Our natural resources will 18 longer if we learn to recycle (循环再用) them. The world population will not rise so quickly if people use modern methods of birth 19 . Finally, if we educate people to think about the problems, we shall have a better and cleaner 20 in the future. | ||||
|