下载文档原格式
高三现代科技前沿探索英语阅读理解20题1<背景文章>Artificial intelligence (AI) is rapidly transforming the field of healthcare. In recent years, AI has made significant progress in various aspects of medical care, bringing new opportunities and challenges.One of the major applications of AI in healthcare is in disease diagnosis. AI-powered systems can analyze large amounts of medical data, such as medical images and patient records, to detect diseases at an early stage. For example, deep learning algorithms can accurately identify tumors in medical images, helping doctors make more accurate diagnoses.Another area where AI is making a big impact is in drug discovery. By analyzing vast amounts of biological data, AI can help researchers identify potential drug targets and design new drugs more efficiently. This can significantly shorten the time and cost of drug development.AI also has the potential to improve patient care by providing personalized treatment plans. Based on a patient's genetic information, medical history, and other factors, AI can recommend the most appropriate treatment options.However, the application of AI in healthcare also faces some challenges. One of the main concerns is data privacy and security. Medicaldata is highly sensitive, and ensuring its protection is crucial. Another challenge is the lack of transparency in AI algorithms. Doctors and patients need to understand how AI makes decisions in order to trust its recommendations.In conclusion, while AI holds great promise for improving healthcare, it also poses significant challenges that need to be addressed.1. What is one of the major applications of AI in healthcare?A. Disease prevention.B. Disease diagnosis.C. Health maintenance.D. Medical education.答案：B。
新概念第四册课文翻译及学习笔记：Lesson39【课文】First listen and then answer the following question.听录音，然后回答以下问题。
What does the 'uniquely rational way' for us to communicate with other intelligent beings in space depend on?We must conclude from the work of those who have studied the origin of life, that given a planet only approximately like our own, life is almost certain to start. Of all the planets in our solar system, we ware now pretty certain the Earth is the only one on which life can survive. Mars is too dry and poor in oxygen, Venus far too hot, and so is Mercury, and the outer planets have temperatures near absolute zero and hydrogen-dominated atmospheres. But other suns, start as the astronomers call them, are bound to have planets like our own, and as is the number of stars in the universe is so vast, this possibility becomes virtual certainty. There are one hundred thousand million starts in our own Milky Way alone, and then there are three thousand million other Milky Ways, or galaxies, in the universe. So the number of the stars that we know exist is now estimated at about 300 million million million.Although perhaps only 1 per cent of the life that has started somewhere will develop into highly complex and intelligent patterns, so vast is the number of planets, that intelligent life is bound to be a natural part of the universe.If then we are so certain that other intelligent life exists in the universe, why have we had no visitors from outer space yet? First of all, they may have come to this planet of ours thousands or millions of years ago, and found our then prevailing primitive state completely uninteresting to their own advanced knowledge. Professor Ronald Bracewell, a leading American radio astronomer, argued in Nature that such a superior civilization, on a visit to our own solar system, may have left an automatic messenger behind to await the possible awakening of an advanced civilization. Such a messenger, receiving our radio and television signals, might well re-transmit them back to its home-planet, although what impression any other civilization would thus get from us is best left unsaid.But here we come up against the most difficult of all obstacles to contact with people on other planets -- the astronomical distances which separate us. As a reasonable guess, they might, on an average, be 100 light years away. (A light year is the distance which light travels at 186,000 miles per second in one year, namely 6 millionmillion miles.) Radio waves also travel at the speed of light, and assuming such an automatic messenger picked up our first broadcastsof the 1920's, the message to its home planet is barely halfway there. Similarly, our own present primitive chemical rockets, though good enough to orbit men, have no chance of transporting us to the nearest other star, four light years away, let alone distances of tens or hundreds of light years.Fortunately, there is a 'uniquely rational way' for us to communicate with other intelligent beings, as Walter Sullivan has put it in his excellent book, We Are not Alone. This depends on the precise radio frequency of the 21-cm wavelength, or 1420 megacycles per second. It is the natural frequency of emission of the hydrogen atoms in space and was discovered by us in 1951; it must be known to any kind of radio astronomer in the universe.Once the existence of this wave-length had been discovered, itwas not long before its use as the uniquely recognizable broadcasting frequency for interstellar communication was suggested. Without something of this kind, searching for intelligences on other planets would be like trying to meet a friend in London without a pre-arranged rendezvous and absurdly wandering the streets in the hope of a chance encounter.ANTHONY MICHAELIS Are There Strangers in Space? from The Weekend Telegraph【New words and expressions 生词和短语】Mercury n. 水星hydrogen n. 氢气prevailing adj. 普遍的radio astronomer 射电天方学家uniquely adv. 地rational adj. 合理的radio frequency 无线电频率cm n. 厘米megacycle n. 兆周emission n. 散发intersteller adj.星际的rendezvous n. 约会地点【课文注释】1.that given a planet only approximately like our own, life is almost certain to start 这是一个宾语从句，作动词conclude的宾语，其中given a planet...our own,过去分词短语作条件状语，given与if的意思相近，这个过去分词短语可译成“如果一个行星与我们所在的行星大致相同的话”。
2024年高考英语气候变化的全球影响与应对单选题30题1.Climate change leads to a rise in sea levels and more frequent extreme weather events, which have a huge impact on the environment. The underlined word “impact” can be replaced by_____.A.influenceB.importanceC.affectionD.consequence答案：A。
“impact”意为“影响”，“influence”也有“影响”之意；“importance”是“重要性”；“affection”是“喜爱”；“consequence”是“结果”。
所以选A。
2.The increase in greenhouse gases is one of the main causes of climate change. Which of the following is not a greenhouse gas?A.carbon dioxideB.oxygenC.methaneD.nitrous oxide答案：B。
“carbon dioxide”（ 二氧化碳）、“methane”（ 甲烷）、“nitrous oxide” 一氧化二氮）都是温室气体，“oxygen” 氧气）不是温室气体。
3.Climate change has caused many species to face extinction. The word “extinction” means_____.A.disappearanceB.reductionC.changeD.protection答案：A。
“extinction”意为“灭绝”，“disappearance”是“消失”；“reduction”是“减少”；“change”是“改变”；“protection”是“保护”。
探究光合作用产生氧气的实验氧气收集方法As we experiment on the production of oxygen during photosynthesis, a crucial aspect to consider is the method of collecting the oxygen gas. One common method that can be used is the downward displacement of water method. This method involves collecting the oxygen gas in an inverted container filled with water.As the oxygen is produced, it displaces the water inside the container, allowing for the collection of the gas.在进行光合作用产生氧气的实验时，收集氧气的方法是一个至关重要的方面。
一个常用的方法是使用向下排水法。
这种方法涉及将氧气集中在一个倒置的装满水的容器内。
当氧气产生时，它会排走容器内的水，从而可以收集氧气。
Another method that can be used for the collection of oxygen gas during photosynthesis experiments is the use of a gas syringe. A gas syringe is a device that can be attached to the reaction vessel where oxygen is being produced. As the oxygen gas is generated, it can be collected directly into the gas syringe, allowing for accurate measurement and observation of the gas produced.在进行光合作用实验时，可以使用的另一种收集氧气的方法是使用气体注射器。
七年级地球构造组成单选题50题1. Scientists believe that the ______ is the thinnest layer of the Earth, which is like the "skin" of our planet. It is where most earthquakes occur.A. mantleB. outer coreC. crustD. inner core答案：C。
解析：地壳是地球最外面的一层，它很薄，就像地球的“皮肤”，并且大多数地震都发生在地壳，所以C正确。
地幔是位于地壳和地核之间的一层，A选项不符合题意。
外核和内核是地核的组成部分，B和D选项也不符合描述。
2. The layer of the Earth that is mainly made up of hot, semi - liquid rock is the ______.A. crustB. mantleC. outer coreD. inner core答案：B。
解析：地幔主要由炎热的半液态岩石组成。
地壳是固态的岩石层，A选项错误。
外核是液态的铁镍层，C选项不符合题意。
内核是固态的铁镍核心，D选项也不正确。
3. Which part of the Earth is thought to be composed of solid iron and nickel?A. MantleB. Outer coreC. CrustD. Inner core答案：D。
解析：内核被认为是由固态的铁和镍组成的。
地幔主要由半液态岩石组成，A选项错误。
外核是液态的铁镍层，B选项错误。
地壳主要由岩石组成，C选项错误。
4. The ______ is the hottest part of the Earth.A. crustB. mantleC. outer coreD. inner core答案：D。
变压器油中气体含量标准The gas content in transformer oil is an important parameter that needs to be monitored and controlled inorder to ensure the proper functioning of the transformer. The presence of gases in transformer oil can indicate various issues, such as degradation of insulation materials, overheating, or the presence of faults or contaminants. Therefore, there are certain standards and requirements set for the gas content in transformer oil. In this essay, wewill discuss these standards and requirements from multiple perspectives.Firstly, it is important to understand the different types of gases that can be present in transformer oil. The most common gases found in transformer oil include oxygen (O2), nitrogen (N2), hydrogen (H2), carbon monoxide (CO), carbon dioxide (CO2), methane (CH4), and ethylene (C2H4). Each of these gases can indicate different issues or conditions within the transformer. For instance, the presence of oxygen can suggest that the transformer isexposed to air, which can lead to oxidation and degradation of the insulation materials. On the other hand, the presence of hydrogen can indicate the presence of partial discharges or overheating.Now, let's discuss the standards and requirements for gas content in transformer oil. The International Electrotechnical Commission (IEC) has set certain limitsfor the gas content in transformer oil. According to the IEC 60599 standard, the total gas content in transformeroil should not exceed 10% by volume. This means that the sum of all the individual gases should not exceed 10% of the total volume of the oil. Additionally, the IEC 60599 standard also specifies limits for specific gases. For example, the maximum limit for oxygen is 2000 ppm (parts per million), while the maximum limit for hydrogen is 500 ppm.Furthermore, it is important to regularly monitor the gas content in transformer oil to ensure that it remains within the specified limits. This can be done through various methods, such as gas chromatography or dissolvedgas analysis (DGA). DGA is a widely used technique that involves extracting a sample of transformer oil and analyzing it for the presence and concentration ofdifferent gases. By regularly monitoring the gas content, any abnormal conditions or faults within the transformer can be detected at an early stage, allowing for timely maintenance or repairs.In addition to the IEC standards, different countries or regions may have their own specific requirements for gas content in transformer oil. For example, in the United States, the American National Standards Institute (ANSI) has set standards for the gas content in transformer oil. These standards, known as the ANSI/IEEE C57.104 andC57.104a, provide guidelines for the interpretation of DGA results and specify limits for various gases. It is important for transformer manufacturers and operators to be aware of these specific requirements in order to ensure compliance.Moreover, it is worth mentioning that the gas content in transformer oil can vary depending on the type anddesign of the transformer, as well as its operating conditions. For instance, transformers with higher voltage ratings or those subjected to heavy loads may experience higher gas content due to increased stress on theinsulation materials. Therefore, it is necessary to consider these factors when determining the acceptable gas content in transformer oil.In conclusion, the gas content in transformer oil is an important parameter that needs to be monitored and controlled. The presence of gases can indicate various issues or conditions within the transformer, and there are certain standards and requirements set for the gas content. The IEC standards, as well as country-specific standards such as ANSI/IEEE, provide guidelines and limits for the gas content in transformer oil. Regular monitoring of the gas content is essential to detect any abnormalities or faults at an early stage. By adhering to these standards and requirements, transformer manufacturers and operators can ensure the proper functioning and longevity of transformers.。
3d打印粉末的含氧量指标English Answer：Oxygen Content in 3D Printing Powders.Oxygen content is a critical parameter for 3D printing powders. It can affect the powder's flowability, printability, and mechanical properties of the printed parts. The optimal oxygen content for a given powder depends on the type of powder, the printing process, and the desired properties of the printed parts.Measuring Oxygen Content.The oxygen content of 3D printing powders can be measured using a variety of techniques, including:Thermogravimetric analysis (TGA): TGA measures the weight loss of a sample as it is heated. The weight loss can be used to calculate the oxygen content of the sample.Gas chromatography-mass spectrometry (GC-MS): GC-MS separates and identifies the different gases in a sample. The amount of oxygen in the sample can be determined by measuring the peak area of the oxygen peak in the GC-MS chromatogram.Elemental analysis: Elemental analysis measures the elemental composition of a sample. The oxygen content of the sample can be determined by measuring the amount of oxygen atoms in the sample.Factors Affecting Oxygen Content.The oxygen content of 3D printing powders can be affected by a variety of factors, including:Powder composition: The composition of the powder can affect its oxygen content. For example, powders that contain metal oxides will have a higher oxygen content than powders that contain pure metals.Manufacturing process: The manufacturing process can also affect the oxygen content of the powder. For example, powders that are produced using a high-temperature process will have a lower oxygen content than powders that are produced using a low-temperature process.Storage conditions: The storage conditions can also affect the oxygen content of the powder. For example, powders that are stored in a humid environment will have a higher oxygen content than powders that are stored in a dry environment.Effects of Oxygen Content.The oxygen content of 3D printing powders can have a significant impact on the powder's flowability, printability, and mechanical properties of the printed parts.Flowability: Oxygen can affect the flowability of powders. Powders with a high oxygen content tend to be less flowable than powders with a low oxygen content. This isbecause the oxygen can form hydrogen bonds with the powder particles, which can make them stick together.Printability: Oxygen can also affect the printability of powders. Powders with a high oxygen content tend to be more difficult to print than powders with a low oxygen content. This is because the oxygen can react with the printing materials, which can cause defects in the printed parts.Mechanical properties: Oxygen can also affect the mechanical properties of printed parts. Parts made from powders with a high oxygen content tend to be weaker and less durable than parts made from powders with a low oxygen content. This is because the oxygen can weaken the bonds between the powder particles.Conclusion.Oxygen content is a critical parameter for 3D printing powders. It can affect the powder's flowability, printability, and mechanical properties of the printedparts. The optimal oxygen content for a given powder depends on the type of powder, the printing process, andthe desired properties of the printed parts.Chinese Answer：3D打印粉末含氧量。
DOI: 10.1016/S1872-5813(21)60177-9铌元素改性V 2O 5-WO 3/TiO 2催化剂降低脱硝过程 SO 2 的氧化率王 博1，边 瑶1，封 硕1，王少奇1，沈伯雄1,2,*（1. 河北工业大学 能源与环境工程学院, 天津市清洁能源利用与污染物控制重点实验室, 天津 300401；2. 河北工业大学 化工学院, 天津 300401）摘 要：本文采用浸渍法制备了Nb 改性的V 2O 5-WO 3/TiO 2催化剂，研究了脱硝反应中Nb 负载量对催化剂SO 2氧化活性的影响。
结果表明，在350 °C 下，Nb 2O 5负载量为2%的Nb 2O 5-V 2O 5-WO 3/TiO 2催化剂上的SO 2氧化率最低（0.6%），而同时NO x 的转化率仍能达到95%。
采用TGA 、氮吸附、XRD 、H 2-TPR 、CO 2-TPD 、XPS 和in- situ DRIFTS 等对催化剂进行了表征分析，结果显示，Nb 改性后V 2O 5-WO 3/TiO 2催化剂的晶体结构没有发生明显改变，但是其比表面积小幅度下降，有助于减少对SO 2的吸附；同时，改性后催化剂表面的吸附氧含量下降，氧化还原性能也稍微减弱，这有利于降低其对SO 2的氧化活性。
in-situ DRIFTS 结果表明，Nb 改性后的Nb-V 2O 5-WO 3/TiO 2催化剂反应过程中表面中间产物VOSO 4的含量明显下降，从而减少了SO 3的生成量。
关键词：SO 2氧化；Nb 改性；V 2O 5-WO 3/TiO 2催化剂；NH 3-SCR 脱硝中图分类号： X51;TQ42 文献标识码： AModification of the V 2O 5-WO 3/TiO 2 catalyst with Nb to reduce its activityfor SO 2 oxidation during the selective catalytic reduction of NO xWANG Bo 1，BIAN Yao 1，FENG Shuo 1，WANG Shao-qi 1，SHEN Bo-xiong1,2,*（1. College of Energy and Environmental Engineering , Hebei University of Technology , Key Laboratory of Clean EnergyUtilization and Pollutant Control in Tianjin , Tianjin 300401, China ；2. College of chemical engineering , Hebei University of Technology , Tianjin 300401, China ）Abstract: A series of Nb-modified V 2O 5-WO 3/TiO 2 catalysts were prepared by the impregnation method and the effect of Nb loading on their SO 2 oxidation activity during the selective catalytic reduction of NO x was investigated.The results indicate that the Nb 2O 5-V 2O 5-WO 3/TiO 2 catalyst with a Nb 2O 5 loading of 2% exhibits the lowest SO 2conversion of 0.6% for oxidation at 350 °C, whereas the conversion of NO x is still above 95%. The catalysts were characterized by TGA, BET, XRD, H 2-TPR, CO 2-TPD, XPS and in-situ DRIFTS. The results illustrate that the influence of Nb modification on the crystal structure of V 2O 5-WO 3/TiO 2 catalyst is rather insignificant; however, the surface area of the Nb 2O 5-V 2O 5-WO 3/TiO 2 catalyst decreases slightly after the modification with Nb, conducing to a decrease of SO 2 adsorption on the catalyst. Meanwhile, the content of oxygen adsorbed on the catalyst surface decreases considerably upon the Nb modification, suggesting a weakened redox performance, which is beneficial to reducing the oxidation of SO 2. The in-situ DRIFTS results illustrate that the content of the intermediate VOSO 4product on the catalyst surface decreases over the Nb-modified Nb 2O 5-V 2O 5-WO 3/TiO 2 catalyst, leading to a decrease of SO 3 production.Key words: SO 2 oxidation ；Nb modification ；V 2O 5-WO 3/TiO 2；removal of NO x by NH 3-SCR烟气中的SO 3主要来源于SO 2与氧气在高温下的直接氧化以及SCR 脱硝催化剂的催化氧化[1]。
