钻石检验员四级(中级)模拟试题及答案解析(2)
钻石检验员四级（中级）模拟试题及答案解析（2）
(1/50)单项选择题
第1题
反射率低于( )的宝石不宜使用反射仪来测其反射率。
A.1.50
B.1.60
C.1.70
D.1.80
下一题
(2/50)单项选择题
第2题
宝石显微镜可用于观察宝石(含钻石)的( )。
A.内部特征
B.外部特征
C.内、外部特征
D.内、外部特征，甚至配加附件扩展其应用范围
上一题下一题
(3/50)单项选择题
第3题
在二碘甲烷溶液中，台面朝下的( )在电筒照摄下可显阳光放射阴影图。
A.钻石
B.钛酸锶
C.合成立方氧化锆
D.钆镓榴石
上一题下一题
(4/50)单项选择题
第4题
合成金红石的色散值高达( )倍，故有刺眼的多彩外观。
A.2
B.3
C.4
D.7
上一题下一题
(5/50)单项选择题
第5题
( )的色散值与钻石色散值很接近。
A.立方氧化锆
B.钆镓榴石
C.钇铝榴石
D.锆石
上一题下一题
(6/50)单项选择题
第6题
观察钻石与仿钻品的底面闪光效应，( )在亭部会出现近一半的橘黄色、蓝色闪光现象。
A.立方氧化锆
B.钆镓榴石
C.钇铝榴石
D.钻石
上一题下一题
(7/50)单项选择题
第7题
钻石负晶在宝石显微镜( )照明下为白色或无色，多呈八面体形态。
A.亮域
B.暗域
C.透射
D.散射
上一题下一题
(8/50)单项选择题
第8题
仿钻品的棱线和角常因材料硬度偏低而呈现( )。
A.圆滑
B.锋利
C.尖锐
D.平直
上一题下一题
(9/50)单项选择题
第9题
纹理是发育在( )钻石表面或内部的一种生长痕迹。
A.天然
B.合成
C.人造
D.人工
上一题下一题
(10/50)单项选择题
第10题
钻石( )显现的特点是：在刻面上沿一个或多个方向的多条平行排列、且间距相似的细线。
A.内部纹理
B.表面纹理
C.表面抛光痕
D.内部云状薄带
上一题下一题
(11/50)单项选择题
第11题
( )中可观察到刻面重影现象。
A.立方氧化锆
B.无色尖晶石
C.钛酸锶
D.碳硅石
上一题下一题
(12/50)单项选择题
第12题
锆石为一种( )。
A.合成立方氧化锆
B.天然宝石
C.合成碳硅石
D.人造立方氧化锆
上一题下一题
(13/50)单项选择题
第13题
立方氧化锆俗称( )。
A.苏联钻
B.美国钻
C.瑞士钻
D.荷兰钻
上一题下一题
(14/50)单项选择题
第14题
钇铝榴石的英文缩写为( )。
A.YAC
B.YAG
C.GGG
D.YGC
上一题下一题
(15/50)单项选择题
第15题
铅玻璃按晶体内部质点排列性划分，属( )。
A.晶质体
B.非晶质体
C.均质体
D.非均质体
上一题下一题
(16/50)单项选择题
第16题
古印度钻石工匠公元前3000年就了解了( )打磨钻石的手工艺方法。
A.利器
B.尖石
C.钻石
D.石器
上一题下一题
(17/50)单项选择题
第17题
钻石的纹理方向确定有助于钻石的分割，锯开钻石往往( )。
大学英语四级真题及答案第三套
2017年12月大学英语四级真题及答案(第三套) Part I Writing (25 minutes) Directions: For this part, you are allowed 30 minutes to write a short essay onhow to best handle the relationshop between teachers and students. You should write at least 120 words but no more than 180 words. Part II Listening Comprehension (25 minutes) Section A Directions: In this section, you will hear three news reports. At the end of each news report, you will hear two or three questions. Both the news report and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D). Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre. Questions 1 and 2 are based on the news report you have just heard. 1. A) Her friend Erika. C) Her grandfather.
大学英语四级第套真题试卷及答案
2017年6月大学英语四级真题及答案 (第一套) Part I Writing (25 minutes) (请于正式开考后半小时内完成该部分，之后将进行听力考试) Directions:For this part, you are allowed 30 minutes to write an advertisement on your campus website to sell a computer you used at college. Your advertisement may include its brand, specifications/features, condition and price, and your contact should write at least 120 words but no more than 180 words. Part II Listening Comprehension (30 minutes) Section A Directions:In this section, you will hear three news reports. At the end of each news report, you will hear two or three questions. Both the news report and questions will be spoken only once. After you hear questions, you must choose the best answer from the four choices marked A), B), C) and D). Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre. 注意：此部分试题请在答题卡1上作答。 Questions 1 to 2 are based on the conversation you have just heard. 1. A) The man in the car was absent-minded. B) The test driver made a wrong judgement. C) The self-driving system was faulty. D) The car was moving at a fast speed. 2. A) They have done better than conventional cars. B) They have caused several severe crashes. C) They have posed a threat to other drivers. D) They have generally done quite well. Questions 3 to 4 are based on the conversation you have just heard. 3. A) He works at a national park. B) He is a queen been specialist. C) He removed the beyond from the boot.
英语四级真题及答案卷三
英语四级真题及答案卷 三 SANY标准化小组 #QS8QHH-HHGX8Q8-GNHHJ8-HHMHGN#
2017年12月英语四级真题 Part I Writing(25 minutes) Directions:For this part,you are allowed 30 minutes to write a short essay on how to best handle the relationship between parents and should write at least 120 words but no more than 180 words. Part II Listening Comprehension(25 minutes) Section A Directions:In this section,you will hear three news the end of each news report,you will hear two or three the news report and the questions will be spoken only you hear a question,you must choose the best answer from the four choices marked A),B),C)and D).Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre.
大学英语四级模拟试题四(附含答案解析)
大学英语四级模拟题四 Part One Reading Comprehension (2’×10 = 20’) Directions: There are 2 passages in this section. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should decide on the best choice and mark the corresponding letter on the Answer Sheet with a single line through the centre. Passage One Air pollution can spread from city to city. It even spreads from one country to another. Some northern European countries have had “black snow”from pollutants that have traveled through the air from other countries and have fallen with the snow. So air pollution is really a global problem. Air pollution can kill babies, older people, and those who have respiratory（呼吸的）diseases. As found in cities, air pollution increases the risks of certain lung diseases. Air pollution can cause both airplane and car accidents because it cuts down visibility （能见度）. There are other possible health dangers from air pollution that we don’t know much about. For example, scientists are trying to find out whether chemicals that reach us from the air may cause changes in our cells. These changes might cause babies to be born with serious birth defects. Scientists are trying to learn how all the many chemicals are apt（易于的）to take into our bodies from air, water, food, and even medicines act together to affect our health and the way our bodies work. That is another reason why it is so important to begin to control pollution now instead of waiting until we learn all the answers. Air pollution costs us a lot of money. It corrodes（腐蚀）our buildings. It damages farm crops and forests. It has a destructive effect on our works of art. The cost of all this damage to our government is great. It would be much more worthwhile, both for us and for the government, to spend our tax dollars on air pollution control. 1. Air pollution may lead to airplane accidents because . A. it may cause pilots to be ill B. engines may fail from the air-borne dirt C. visibility is reduced D. it brings a lot of black snow 2. Scientists are trying to find a link between pollution and . A. intelligence levels B. birth problems C. man’s behavior D. the nervous system 3. Scientists have not yet determined . A. all of the effects of pollution on the human body B. how pollution can be controlled successfully C. when the atmosphere first became polluted D. how some snow becomes black 4. The author suggests that before air pollution becomes more serious, . A. factories will be forced to stop operating B. buildings should be protected C. the earth will begin to grow colder D. more money should be spent to solve the problem 5. We can conclude that . A. civilization may be ruined if pollution is not controlled B. pollution is more serious in Europe than it is in America C. most people do not know that pollution is a serious problem D. we should learn all the answers before we begin to control pollution Passage Two Stiletto heels could be banned from the workplace because of health and safety reasons, according to British Trade Union bosses. The Trade Union Congress, predominantly male, has proposed a motion arguing that high heels are disrespectful to women while they also contribute to long term injuries. They propose instead that women wear “sensible shoes”with an inch heel limit in an attempt to avoid future foot and back pain as well as injuries. The motion is due to be debated at next month’s conference. The motion states: “Congress believes high heels may look glamorous on the Hollywood catwalks but are completely in appropriate for the day-to-day working environment. Feet bear the burden of daily life, and for many workers prolonged standing, badly fitted footwear, and in particular high heels can be a hazard. Around two million days a year are lost through sickness as a result of lower limb disorders. Wearing high heels can cause long-term foot problems and also serious foot, knee and back pain and damaged joints. Many employers in the retail sector force women workers to wear high heels as part of their dress code. More must be done to raise awareness of this problem so that women workers and their feet are protected.” Nadline Dorries, the Tory Member of Parliament, however criticized the motion and said the extra height heels give women can help them when in the workplace. “I’m 5ft 3in and need every inch of my Christian Louboutin heels to look my male colleagues in the eye,”she said. “If high heels were banned in Westminster, no one would be able to find me. The Trade Union leaders need to get real, stop using obvious sexist tactics by discussing women’s
大学英语四级考试真题及答案(完整版)
大学英语四级考试真题及答案(绝对完整） Part I Writing (30 minutes) Directions: For this part, you are allowed 30 minute to write a short essay on the topic of students selecting their lectures. You should write at least 120 words following the outline given bellow: 1. 越来越多的博物馆免费对外开放的目的是什么？ 2. 也会带来一些问题 3. 你的看法？ Part II Reading Comprehension (Skimming and Scanning) (15 minutes)Directions: In this part, you will have 15 minutes to go over the passage quickly and answer the questions on Answer Sheet 1. For questions 1-7, choose the best answer from the four choices marked A),B),C) and D). For questions 8-10, complete the sentences with the information given in the passage. How Do You See Diversity? As a manager, Tiffany is responsible for interviewing applicants for some of the positions with her company .During one interview, she noticed that the candidate never made direct eye contact. She was puzzled and somewhat disappointed because she liked the individual otherwise. He had a perfect resume and gave good responses to her questions, but the fact that he never looked her in the eye said “untrustworthy,” so she decided to offer the job to her second choice. “It wasn’t until I attended a diversity workshop that I realized the person we passed over was the perfect person,” Tiffany confesses. What she hadn’t known at the time of the interview was that the candidate’s “different” behavior was simply a cultural misunderstanding . He was an Asian-American raised in a household where respect for those in authority was shown by averting(避开) your eyes. “I was just thrown off by the lack of ye contact; not realizing it was cultural,” Tiffany says. “I missed out ,but will not miss that opportunity again.” Many of us have had similar encounters with behaviors we perceive as different. As the world becomes smaller and our workplaces more diverse, it is becoming essential to expand our under-standing of others and to reexamine some of our false assumptions . Hire Advantage At a time when hiring qualified people is becoming more difficult ,employers who can eliminate invalid biases(偏爱) from the process have a distinct advantage .My company, Mindsets LLC ,helps organizations and individuals see their own blind spots . A real estate recruiter we worked with illustrates the positive difference such training can make .
英语四级真题及答案
2017年6月英语四级真题 作文一： For this part,you are allowed 30 minutes to write a short essay based on the picture below. You should start your essay with a brief account of the impact of the Internet on the way people communicate and then explain whether electronic communication can replace face-to-face contact.You should write at least 120 words but no more than 180 words. “Dear Andy-How are you? Your mother and I are fine.We both miss you and hope you are doing well.We look forward to seeing you again the nest time your computer crashes and you come down-stairs for something to eat,Love,Mom and Dad.” 作文二： For this part,you are allowed 30 minutes to write a short essay based on the picture below. You should start your essay with a brief account of the impact of the Internet on learning and then explain why doesn’t simply mean learning to obtain information. You should write at least 120 words but no more than 180 words.
2014-2019历年大学英语四级真题及答案
2014-2019历年大学英语四级真题及答案 2014年6月大学英语四级考试真题 Part I Writing （30 minutes） Directions: For this part, you are allowed 30 minutes to write a short essay on the following question. You should write at least 120 words but no more than 180 words. Suppose a foreign friend of yours is coming to visit China, what is the first place you would like to take him/her to see and why? Part II Listening Comprehension （30 minutes） Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A）, B）, C）and D）, and decide which is the best answer. Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre. 1. A）The man should visit the museums. B）She can’t stand the hot weather. C）The beach resort is a good choice. D）She enjoys staying in Washington. 2. A）Her new responsibilities in the company. B）What her job prospects are. C）What the customers’ feedbac k is. D）The director’s opinion of her work. 3. A）Combine her training with dieting. B）Repeat the training every three days. C）Avoid excessive physical training. D）Include weightlifting in the program. 4. A）When she will return home. B）Whether she can go by herself. C）Whether she can travel by air. D）When she will completely recover. 5. A）The woman knows how to deal with the police. B）The woman had been fined many times before. C）The woman had violated traffic regulations. D）The woman is good at finding excuses. 6. A）Switch off the refrigerator for a while. B）Have someone repair the refrigerator. C）Ask the man to fix the refrigerator. D）Buy a refrigerator of better quality. 7. A）He owns a piece of land in the downtown area. B）He has got enough money to buy a house. C）He can finally do what he has dreamed of. D）He is moving into a bigger apartment. 8. A）She is black and blue all over. B）She has to go to see a doctor. C）She stayed away from work for a few days. D）She got hurt in an accident yesterday.
大学英语四级考试真题及答案完整版
精品文档 2014年6月大学英语四级考试真题及答案（完整版） 来源：文都教育 Part I Writing (30 minutes) Directions: For this part, you are allowed 30 minutes to write a short essay on the following topic. You should write at least 120 words but no more than 180 words. Suppose a foreign friend of yours is coming to visit your hometown, what is the most interesting place you would like to take him/her to see and why? 注意：此部分试题请在答题卡1上作答。 Part II Listening Comprehension (30 minutes) Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A), B), C) and D), and decide which is the best answer. Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre. 注意：此部分试题请在答题卡1上作答。 1. A) See a doctor about her strained shoulder. B) Use a ladder to help her reach the tea. C) Replace the cupboard with a new one. D) Place the tea on a lower shelf next time. 2. A) At Mary Johnson's. C) In an exhibition hall. B) At a painter's studio. D) Outside an art gallery. 3. A) The teacher evaluated lacks teaching experience. B) She does not quite agree with what the man said. C) The man had better talk with the students himself. D) New students usually cannot offer a fair evaluation. 4. A) He helped Doris build up the furniture. B) Doris helped him arrange the furniture.
2018年大学英语四级真题答案及解析68632
2018年6月大学英语四级真题（第1套) Part I Writing （30 minutes） Directions:For this part, you are allowed 30minutes to write a short essay on the importance of reading ability and how to develop it. You should write at least 120 words but no more than 180 words. ________________________________________________________________________ ________________________________________________________________________ ________________________________________________________________________ Part II Listening Comprehension (25 minutes) Section A Directions: In this section, you will hear three news reports. At the end of each news report, you will hear two or three questions. Both the news report and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D). Then mark the corresponding letter on Answer Sheet 1 with a single line through the centre. Questions 1 and 2 are based on the news report you have just heard. 1.A) The return of a bottled message to its owner's daughter. B) A New Hampshire man's joke with friends on his wife. C) A father's message for his daughter. D) The history of a century-old motel. 2. A) She wanted to show gratitude for his kindness. B) She wanted to honor her father's promise. C) She had been asked by her father to do so. D) She was excited to see her father's handwriting. Questions 3 and 4 are based on the news report you have just heard. 3. A) People were concerned about the number of bees. B) Several cases of Zika disease had been identified. C) Two million bees were infected with disease. D) Zika virus had destroyed some bee farms. 4. A) It apologized to its customers. B) It was forced to kill its bees. C) It lost a huge stock of bees. D) It lost 2.5 million dollars. Questions 5 to 7 are based on the news report you have just heard. 5. A) It stayed in the air for about two hours. B) It took off and landed on a football field. C) It proved to be of high commercial value. D) It made a series of sharp turns in the sky. 6. A) Engineering problems. B) The air pollution it produced.
英语四级模拟试题及答案.
Part II Reading Comprehension (35 minutes) Directions: There are 4 passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A), B), C) and D). You should decide on the best choice and mark the corresponding letter on the Answer Sheet with a single line through the center. Passage One Questions 21 to 25 are based on the following passage. Unless we spend money to spot and prevent asteroids (小行星) now, one might crash into Earth and destroy life as we know it, say some scientists. Asteroids are bigger versions of the meteoroids (流星) that race across the night sky. Most orbit the sun far from Earth and don’t threaten us. But there are also thousands of asteroids whose orbits put them on a collision course with Earth. Buy $50 million worth of new telescopes right now. Then spend $10 million a year for the next 25 years to locate most of the space rocks. By the time we spot a fatal one, the scientists say, we’ll have a way to change its course. Some scientists favor pushing asteroids off course with nuclear weapons. But the cost wouldn’t be cheap. Is it worth it? Two things experts consider when judging any risk re: 1) How likely the event is; and 2) How bad the consequences if the event occurs. Experts think an asteroid big enough to destroy lots of life might strike Earth once every 500,000 years. Sounds pretty rare—but if one did fall, it would be the end of the world. “If we don’t take care of these big asteroids, they’ll take care of us,” says one scientist. “It’s that simple.” The cure, though, might be worse than the disease. Do we really want fleets of nuclear weapons sitting around on Earth? “The world has less to fear from doomsday (毁灭性的) rocks than from a great nuclear fleet set against them,” said a New York Times article. 21. What does the passage say about asteroids and meteoroids? A) They are heavenly bodies different in composition. B) They are heavenly bodies similar in nature.