(共37张PPT)
英语说明文阅读理解
例题讲解
文章体裁:说明文
字数统计:347
主题:主要介绍了原子钟和正在研发中的
核钟(nuclear clock)的技术特点、工作原理
以及潜在的应用前景。
①For the precise timekeeper, only an atomic clock will do. While the best quartz (石英) timepieces will lose a millisecond every six weeks, an atomic clock might not lose a thousandth of one in a decade. Such devices are accurate enough to drive everything from GPS and the internet to stock-market trading. However, researchers are now working on a successor: the nuclear clock. Ekkehard Peik, a pioneer in the field, says such a clock could be 1,000 times more accurate than today’s atomic clocks.
②Atomic clocks work by exciting the electrons around an atom’s nucleus (原子核) with incoming radiation of a specific frequency, with each wave cycle corresponding to a “tick.” Nuclear clocks would function similarly but would use the transitions of neutrons and protons (中子和质子) inside the nucleus.
③The most promising candidate nucleus is thorium-229, which uniquely, has a nuclear transition that lasers (激光) should be able to activate. The exact frequency at which this occurs, however, has long been unknown. Researchers Chuankun Zhang and Jun Ye, from the University of Colorado in Boulder, bypassed this challenge by developing a custom-built laser capable of generating a range of frequencies around the expected transition point. When they fired it at the target, one particular light stream matched the nuclear transition frequency. Although the system needs optimization, Zhang says, “It’s the first demonstration that all the components of a nuclear clock are here.”
④Because atomic clocks are already more than accurate enough for most practical uses, scientists are not aiming to replace them. Instead, they are more interested in the advantages of having two independent methods for measuring time, as beyond precise timekeeping, nuclear clocks could have broader applications in fundamental physics. One potential use is in testing Einstein’s theory of relativity, which suggests, among other things, that clocks should tick more slowly in stronger gravitational fields. If nuclear clocks show any differences in their response compared to atomic clocks under such conditions, it could motivate a rethinking of these well-established theories.
习题讲解
1. What do we know about atomic clocks
A. They are less accurate than quartz timepieces.
B. They are accurate enough for nearly all practical uses today.
C. The difference between atomic and quartz clocks is insignificant.
D. They are not reliable enough for technologies like GPS or stock trading.
细节理解题
习题讲解
A. They are less accurate than quartz timepieces.它们不如石英表准确。
①For the precise timekeeper, only an atomic clock will do. While the best quartz (石英) timepieces will lose a millisecond every six weeks, an atomic clock might not lose a thousandth of one in a decade.
对于精确的计时员来说,只有原子钟才能做到。虽然最好的石英计时器每六周会损失一毫秒,但原子钟在十年中可能不会损失千分之一毫秒。
习题讲解
B. They are accurate enough for nearly all practical uses today.对于今天几乎所有的实际应用来说,它们都足够精确。
①Such devices are accurate enough to drive everything from GPS and the internet to stock-market trading.
这些设备足够精确,可以驱动从GPS和互联网到股票市场交易的一切事物。
习题讲解
C. The difference between atomic and quartz clocks is insignificant.
原子钟和石英钟之间的差别是微不足道的。
①While the best quartz (石英) timepieces will lose a millisecond every six weeks, an atomic clock might not lose a thousandth of one in a decade.
虽然最好的石英计时器每六周会损失一毫秒,但原子钟在十年中可能不会损失千分之一毫秒。
习题讲解
D. They are not reliable enough for technologies like GPS or stock trading.它们对于GPS或股票交易等技术来说不够可靠。
①Such devices are accurate enough to drive everything from GPS and the internet to stock-market trading.
这些设备足够精确,可以驱动从GPS和互联网到股票市场交易的一切事物
习题讲解
2.What breakthrough did Chuankun Zhang and Jun Ye achieve
A. They predicted the exact frequency of the thorium-229 nuclear transition.
B. They discovered a new type of nuclear transition in thorium-229.
C. They built a laser to target frequencies near the transition point.
D. They used a microwave-based laser to measure the thorium-229 transition.
细节理解题
③ The exact frequency at which this occurs, however, has long been unknown. Researchers Chuankun Zhang and Jun Ye, from the University of Colorado in Boulder, bypassed this challenge by developing a custom-built laser capable of generating a range of frequencies around the expected transition point. When they fired it at the target, one particular light stream matched the nuclear transition frequency. 然而,这种情况发生的确切频率长期以来一直是未知的。来自博尔德科罗拉多大学的研究人员张传坤和叶军绕过了这一挑战,他们开发了一种定制的激光器,能够在预期的过渡点周围产生一系列频率。当他们向目标发射时,一束特殊的光流与核跃迁频率相匹配。
习题讲解
2.What breakthrough did Chuankun Zhang and Jun Ye achieve
A. They predicted the exact frequency of the thorium-229 nuclear transition.
B. They discovered a new type of nuclear transition in thorium-229.
C. They built a laser to target frequencies near the transition point.
D. They used a microwave-based laser to measure the thorium-229 transition.
细节理解题
习题讲解
细节理解题
3.The text suggests that Einstein’s theories of relativity might need revision if ______.
A. atomic clocks stop working accurately in strong gravity
B. nuclear clocks prove to be more accurate than atomic clocks
C. scientists discover a new force beyond the nuclear and electromagnetic forces
D. nuclear clocks tick differently in strong gravity compared to atomic clocks
④ One potential use is in testing Einstein’s theory of relativity, which suggests, among other things, that clocks should tick more slowly in stronger gravitational fields. If nuclear clocks show any differences in their response compared to atomic clocks under such conditions, it could motivate a rethinking of these well-established theories.
一个潜在的用途是测试爱因斯坦的相对论,该理论表明,在其他方面,时钟应该在更强的引力场中走得更慢。如果在这种条件下,核时钟与原子钟的反应有任何不同,就可能促使人们重新思考这些已经确立的理论。
习题讲解
细节理解题
3.The text suggests that Einstein’s theories of relativity might need revision if ______.
A. atomic clocks stop working accurately in strong gravity
B. nuclear clocks prove to be more accurate than atomic clocks
C. scientists discover a new force beyond the nuclear and electromagnetic forces
D. nuclear clocks tick differently in strong gravity compared to atomic clocks
理论表明
习题讲解
Which of the following can be the best title for the text
A. The End of Atomic Time: A New Clock Redefining Precision
B. The New Age of Timekeeping: From Quartz to Atomic Clocks
C. The Nuclear Revolution: A Clock That Changed Our Understanding of Time
D. The Test of Time: A New Clock Challenging the Laws of Physics
标题归纳题--首尾段
①For the precise timekeeper, only an atomic clock will do. 对于精确计时器来说,只有原子钟才能做到。While the best quartz (石英) timepieces will lose a millisecond every six weeks, an atomic clock might not lose a thousandth of one in a decade. Such devices are accurate enough to drive everything from GPS and the internet to stock-market trading. However, researchers are now working on a successor: the nuclear clock.然而,研究人员现在正在研究一种继任者:核时钟。 Ekkehard Peik, a pioneer in the field, says such a clock could be 1,000 times more accurate than today’s atomic clocks.这样的时钟可能比现在的原子钟精确1000倍。
④Because atomic clocks are already more than accurate enough for most practical uses, scientists are not aiming to replace them. Instead, they are more interested in the advantages of having two independent methods for measuring time, as beyond precise timekeeping, nuclear clocks could have broader applications in fundamental physics. One potential use is in testing Einstein’s theory of relativity, which suggests, among other things, that clocks should tick more slowly in stronger gravitational fields. If nuclear clocks show any differences in their response compared to atomic clocks under such conditions, it could motivate a rethinking of these well-established theories.
习题讲解
Which of the following can be the best title for the text
A. The End of Atomic Time: A New Clock Redefining Precision
B. The New Age of Timekeeping: From Quartz to Atomic Clocks
C. The Nuclear Revolution: A Clock That Changed Our Understanding of Time
D. The Test of Time: A New Clock Challenging the Laws of Physics
标题归纳题--首尾段
文章体裁:说明文
字数统计:372
主题:主要介绍了萨尔瓦多·达利的“钥匙睡眠法”
这是一种激发创造力的方法。
①Salvador Dali, a great painter, had a strange way of refreshing his mind-something he called “slumber with a key”. In his book, he described how it worked. “You must seat yourself in an armchair. In your left hand, you hold a heavy key, hanging above a plate. Then, you will have merely to let yourself progressively fall into a peaceful afternoon sleep. As you fall asleep gradually, the key will slip from your fingers and clang (叮当作响) on the plate, awakening you,” he wrote.
②Now Dali’s mysterious-sounding method has been documented by science. “We show that this period between wake and sleep is very inspiring for creativity-and napping (打盹) with an object in hand might help to tap into this creative sweet spot,” said Delphine Oudiette, a sleep researcher at the Paris Brain Institute.
③Oudiette and her colleagues conducted an experiment-103 volunteers were asked to complete a series of math problems. Unbeknown to the participants, there was a quick shortcut to solve them. The volunteers were asked to copy Dali’s method but pinching (捏) a plastic bottle with their fingertips rather than a key. Some took a Dali-style micro nap, some napped longer, and others didn’t nap at all.
④A fterwards, the researchers asked all the volunteers to solve the math problems and found volunteers who took micro naps were nearly three times as likely to figure out the problem-solving trick, compared to those who didn’t nap at all. Those who slept for longer periods actually did worse than both those who briefly slept and those who stayed awake.
⑤The researchers think in this stage, you have the best of the two worlds: sleep and wake. So you lose control of your thoughts and have loose associations-make distant associations between different memories-and that could be helpful for creativity. Meanwhile, you keep some awareness that might help you recognize when you have a great idea.
⑥Oudiette says the next step of her work will involve repeating the experiment with other creative tasks beyond math problems to know more about the mechanism-and maybe try to teach people to reach this creative sweet spot.
1. How does Salvador Dali’s “slumber with a key” method work
A. By encouraging creativity while we’ re half asleep.
B. By strengthening memory in a relaxed state.
C. By improving sleeping quality with a key in hand.
D. By staying awake to have a peaceful afternoon sleep.
细节理解题
①Salvador Dali, a great painter, had a strange way of refreshing his mind-something he called “slumber with a key”. In his book, he described how it worked. “You must seat yourself in an armchair. In your left hand, you hold a heavy key, hanging above a plate. Then, you will have merely to let yourself progressively fall into a peaceful afternoon sleep. As you fall asleep gradually, the key will slip from your fingers and clang (叮当作响) on the plate, awakening you,” he wrote.
你只需要让自己逐渐进入一个宁静的午后睡眠。当你逐渐入睡时,钥匙会从你的手指滑落,在盘子上发出叮当声(叮当作响),唤醒你。
②Now Dali’s mysterious-sounding method has been documented by science. “We show that this period between wake and sleep is very inspiring for creativity-and napping (打盹) with an object in hand might help to tap into this creative sweet spot,”
1. How does Salvador Dali’s “slumber with a key” method work
A. By encouraging creativity while we’ re half asleep.
B. By strengthening memory in a relaxed state.
C. By improving sleeping quality with a key in hand.
D. By staying awake to have a peaceful afternoon sleep.
2.What can we learn about the experiment of Oudiette
A. The volunteers were asked to solve a math problem.
B. The volunteers did the same as Dali had done.
C. The volunteers taking a shorter sleep did best.
D. The volunteers sleeping longer got the answers faster.
细节理解题
A. The volunteers were asked to solve a math problem.
③Oudiette and her colleagues conducted an experiment-103 volunteers were asked to complete a series of math problems.
B. The volunteers did the same as Dali had done.
The volunteers were asked to copy Dali’s method but pinching (捏) a plastic bottle with their fingertips rather than a key.
C. The volunteers taking a shorter sleep did best.
④found volunteers who took micro naps were nearly three times as likely to figure out the problem-solving trick, compared to those who didn’t nap at all. Those who slept for longer periods actually did worse than both those who briefly slept and those who stayed awake.
D. The volunteers sleeping longer got the answers faster.
3.What is paragraph 5 mainly about
A. The subjects of the experiment.
B. The purpose of the experiment.
C. The findings of the experiment.
D. The theoretical analysis of the experiment.
段落主旨题
⑤The researchers think in this stage, you have the best of the two worlds: sleep and wake. So you lose control of your thoughts and have loose associations-make distant associations between different memories-and that could be helpful for creativity. Meanwhile, you keep some awareness that might help you recognize when you have a great idea.研究人员认为,在这个阶段,你拥有两个世界中最好的:睡眠和清醒。因此,你失去了对自己思想的控制,产生了松散的联想——在不同的记忆之间建立遥远的联系——这可能有助于创造力。与此同时,你保持一些意识,这可能会帮助你意识到你什么时候有一个好主意。
3.What is paragraph 5 mainly about
A. The subjects of the experiment.
B. The purpose of the experiment.
C. The findings of the experiment.
D. The theoretical analysis of the experiment.
主题、题材
目的
发现
理论分析
4.What will Oudiette do in her follow-up work
A. Research into napping with different tasks.
B. Conduct more experiments on math problems.
C. Study the mechanism of various napping.
D. Teach people how to complete creative tasks.
细节理解题
⑥Oudiette says the next step of her work will involve repeating the experiment with other creative tasks beyond math problems to know more about the mechanism-and maybe try to teach people to reach this creative sweet spot.
Oudiette说,她的下一步工作将包括在数学问题之外的其他创造性任务中重复这个实验,以了解更多关于这个机制的知识,并可能试图教会人们达到这个创造性的最佳点。
4.What will Oudiette do in her follow-up work
A. Research into napping with different tasks.
B. Conduct more experiments on math problems.
C. Study the mechanism of various napping.
D. Teach people how to complete creative tasks.
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