题目内容
17.Scientists have discovered a special biological behavior in dolphins(海豚) that could lead to a treatment for late-onset diabetes(晚发的糖尿病) in humans.Studies on dolphins found that healthy dolphins switch into a diabetic-like state overnight when they are not feeding,but return to normal when they eat the following morning.The extraordinary finding has led scientists to suggest that dolphins have"genetic switch"that allows them to imitate diabetes while they are not feeding for a night,without suffering any ill effect.
If researchers can identify a similar genetic pathway in human,they may be able to develop drugs to effectively switch off diabetes.Some 2.2 million people in Britain have type 2 (or late-onset) diabetes,a figure that is expected to reach 4million by 2025 as a consequence of rising levels of obesity(肥胖).
The tissues of people with type 2 diabetes have become resistant to insulin(胰岛素)so they lose the ability to control sugar levels in their blood.The condition can damage the heart,eyes,kidneys(肾脏) and nerves and contribute to 5% of all deaths,according to the World Healthy Organization.
Dolphins appear to imitate diabetes to keep high levels of blood sugar when food is rare.Like humans,dolphins need some sugar in their blood for their brains to function normally.Venn-Watson's team analyzed 1,000 blood samples(样本) from 52 dolphins while they didn't eat anything overnight an fed in the morning.At night time,the dolphins'metabolism(新陈代谢)changed greatly and showed similar characteristics to that seen in people with type 2 diabetes.
"It is our hope that this discovery can lead to new ways to prevent,treat and maybe even cure diabetes in humans,"said Stephanie Venn-Watson,director of clinical research at the National Marine Foundation in San Diego.
32.What's the main idea of the passage?B
A.Dolphins should be fed regularly to avoid diabetes.
B.Humans get some idea of treating diabetes from dolphins.
C.Dolphins can switch into a diabetic-like state overnight.
D.Humans can suffer the same disease as dolphins.
33.The key to applying the finding to curing human diabetes lies inD.
A.analyzing more blood samples from hungry dolphins
B.producing insulin in a larger amount
C.developing drugs from healthy dolphins
D.identifying a similar genetic pathway in human
34. Which of the following statements is TRUE according to the passage?C
A.Dolphins imitate diabetes to avoid a high blood sugar level.
B.Scientists have found a similar genetic switch in humans.
C.More British people will suffer type 2 diabetes due to obesity.
D.2.2million people with type 2 diabetes die in Britain every year.
35.What will happen to dolphins if not fed for a night according to Venn-Watson?A
A.They keep high levels of blood sugar.
B.Their metabolism breaks down.
C.They become resistant to insulin.
D.Their heart and kidneys are damaged.
分析 本文是一篇科教类阅读,属于说明文,主要讲述了通过海豚的一些行为,科学家发现海豚的这些行为可以用于治疗糖尿病.
解答 32.B.主旨大意题.根据第一段的句子:Scientists have discovered a special biological behavior in dolphins(海豚) that could lead to a treatment for late-onset diabetes(晚发的糖尿病) in humans.可知文章介绍的是人类可以从海豚的行为上得到一些治疗糖尿病的主意,故选B.33.D.细节理解题.根据第三段的句子:If researchers can identify a similar genetic pathway in human,they may be able to develop drugs to effectively switch off diabetes.可知将这个发现应用于治疗糖尿病人的关键是在人类身上识别相似的基因通道,故选D.
34.C.细节理解题.根据第三段的句子:Some 2.2 million people in Britain have type 2 (or late-onset) diabetes,a figure that is expected to reach 4 million by 2025 as a consequence of rising levels of obesity(肥胖).可知更多的英国人将因为肥胖患II型糖尿病,故选C.
35.A.细节理解题.根据倒数第二段的句子:Dolphins appear to imitate diabetes to keep high levels of blood sugar when food is rare.可知如果海豚一个晚上不吃的话血糖会保持在一个高水平,故选A.
点评 本文是一篇科教类阅读,题目涉及多道主旨大意题,细节理解题,推理判断题.做题时学生应仔细阅读原文,把握文章主要内容,联系文章上下文内容并结合所给选项含义,从中选出正确答案,一定要做到有理有据,切忌胡乱猜测.
A. | if invited | B. | even if invited | C. | until invited | D. | when invited |
A. | get; across | B. | get; over | C. | give; away | D. | give; out |
A. | uncertain | B. | frightening | C. | fortunate | D. | unsuitable |
A. | if only | B. | unless | C. | even if | D. | only if |
A. | to achiever | B. | to be achieved | C. | being achieved | D. | achieved |
A. | that | B. | how | C. | whether | D. | what |