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Bats are the only mammals that can fly a great distance, but they阅读理解答案           ★★★
Bats are the only mammals that can fly a great distance, but they阅读理解答案
作者:佚名 文章来源:网络 点击数: 更新时间:2018/9/22 16:06:08

Bats are the only mammals that can fly a great distance, but they have another ability. Many bats live a very long time for an animal of their size. European researchers are studying bats to understand why they live so long. They hope to make discoveries aimed at fighting the aging process in human beings.
Last week, the group of scientists said they had discovered important biological qualities in some bat species.The group studied bat chromosomes(染色体). The scientists were most interested in structures connected to the ends of the chromosomes. They are called telomeres(端粒),which shorten each time a cell divides. Scientists believe this shortening process causes cells to break down. They say this is what causes aging.
The European researchers studied 493 bats from four bat species. The group used information that had been gathered over more than 60 years. Of these animals, the greater mouse-eared bat generally lived an average of 37 years.The scientists said it had telomeres that did not shorten with age. Another Myotis bat holds the record for oldest age, reaching 41 years.The scientists’ findings suggest that these bats’ cells have the ability to maintain and repair their telomeres. This, they said, helps guard against the aging process.
Based on its body size, a bat like the greater mouse-eared bat would be expected to live four years. But, these mammals have been found to live nearly 10 times longer than that. The scientists found that only 19 species of mammals live longer than humans when their body size is considered. Eighteen of these are bats. The only exception is an unusual African rat.
32. What decides bats’ aging process according to the text?     .
A. The body size of the bat        B. The type of chromosomes
C. The building of cell            D. The length of telomeres
33. How long does a greater mouse-eared bat generally live?
A. 19 years.    B. 41 years.     C. 37 years.    D. 60 years.
34. We can learn from the text that  _________    .
A. nineteen kinds of bats could live longer than humans   
B. the scientists have studied bats for more than six decades
C. the bats studied in the research are of the same species 
D. researchers focus on finding out why humans live long
35. In which column of a magazine can you read the text?
A. Science      B. Lifestyle     C. Fashion      D. Business
32-35 DCBA


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