Scientists have devised a way to determine roughly where a person has lived using a strand (缕) of hair, a technique that could help track the movements of criminal suspects or unidentified murder victims. The method relies on measuring how chemical variations in drinking water show up in people's hair. "You're what you eat and drink, and that's recorded in you hair," said Thure Cerling, a geologist at the University of Utah. While US diet is relatively identical, water supplies vary. The differences result from weather patterns. The chemical composition of rainfall changes slightly as rain clouds move. Most hydrogen and oxygen atoms in water are stable, but traces of both elements are also present as heavier isotopes (同位素). The heaviest rain falls first. As a result, storms that form over the Pacific deliver heavier water to California than to Utah. Similar patterns exist throughout the US. By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can construct a geographic timeline. Each inch of hair corresponds to about two months. Cerling's team collected tap water samples from 600 cities and constructed a map of the regional differences. They checked the accuracy of the map by testing 200 hair samples collected from 65 barber shops. They were able to accurately place the hair samples in broad regions roughly corresponding to the movement of raid systems. "It's not good for pinpointing (精确定位)," Cerling said. "It's good for eliminating many possibilities." Todd Park, a local detective, said the method has helped him learn more about an unidentified woman whose skeleton was found near Great Salt Lake. The woman was 5 feet tall. Police recovered 26 bones, a T-shirt and several strands of hair. When Park heard about the research, he gave the hair samples to the researchers. Chemical testing showed that over the two years before her death, she moved about every two months. She stayed in the Northwest, although the test could not be more specific than somewhere between eastern Oregon and western Wyoming. "It's still a substantial area," Park said "But it narrows it way down for me."
A. 1. What is the scientists' new discovery?A) One's hair growth has to do with the amount of water they drink.B) A person's hair may reveal where they have lived. √C) Hair analysis accurately identifies criminal suspects.D) The chemical composition of hair varies from person to person.答案：B解析：第一段，由第一段可知，B选项为其同义表达。A和D文中未提到。C选项首先错在了accurately这个词上，因为原文说的是roughly，这里是自相矛盾，故选B。2. What does the author mean by "You're what you eat and drink (Para. 3)"?A) Food and drink affect one's personality development.B) Food and drink preferences vary with individuals.C) Food and drink leave traces in one's body tissues. √D) Food and drink are indispensable to one's existence.答案：C解析：第二、三段，答案在第三段的上下文都可以看出，比较简单。A, B, D中都含有明显的无中生有的信息，而且还不是生词，很好排除，故选C。3. What is said about the rainfall in America's West?A) There is much more rainfall in California than in Utah.B) The water it delivers becomes lighter when it moves inland. √C) Its chemical composition is less stable than in other areas.D) It gathers more light isotopes as it moves eastward.答案：B解析：第五段最后一句话。原文的意思是：氢和氧这两种原子有同位素，最重的雨会首先降下来，结果导致太平洋洋面上形成的雨会在离海岸较近的加利福尼亚州先降下来（此时的雨比较重，是含大原子量同位素的水），而轻一点的雨会等到更内陆的地方比如犹他州再降下来。原文说的heavier rainfall很容被误解成事more rainfall，但这里不是，heavier指的就是雨水的分子量重，而不是雨多。A的干扰性很大。C错得比较明显，因为原文说了氢氧原子是稳定的，而且也并没有把这里的水的稳定性和别的地区作比较，属于自相矛盾。D项文中未提到，故选B。4. What did Cerling's team produce in their research?A) A map showing the regional differences of tap water. √B) A collection of hair samples from various barber shops.C) A method to measure the amount of water in human hair.D) A chart illustrating the movement of the rain system.答案：A解析：第七段第一句话。B选项为文中内容，但是答非所问，因为他们是用那个这些头发来验证这张地图，而并不是Cerling团队的产物。C, D选项在原文中都没有，故选A。5. What is the practical value of Cerling's research?A) It helps analyze the quality of water in different regions.B) It helps the police determine where a crime is committed.C) It helps the police narrow down possibilities in detective work. √D) It helps identify the drinking habits of the person under investigation.
B. 1. What is the scientists' new discovery?A) One's hair growth has to do with the amount of water they drink.B) A person's hair may reveal where they have lived. √C) Hair analysis accurately identifies criminal suspects.D) The chemical composition of hair varies from person to person.答案：B解析：第一段，由第一段可知，B选项为其同义表达。A和D文中未提到。C选项首先错在了accurately这个词上，因为原文说的是roughly，这里是自相矛盾，故选B。2. What does the author mean by "You're what you eat and drink (Para. 3)"?A) Food and drink affect one's personality development.B) Food and drink preferences vary with individuals.C) Food and drink leave traces in one's body tissues. √D) Food and drink are indispensable to one's existence.答案：C解析：第二、三段，答案在第三段的上下文都可以看出，比较简单。A, B, D中都含有明显的无中生有的信息，而且还不是生词，很好排除，故选C。3. What is said about the rainfall in America's West?A) There is much more rainfall in California than in Utah.B) The water it delivers becomes lighter when it moves inland. √C) Its chemical composition is less stable than in other areas.D) It gathers more light isotopes as it moves eastward.答案：B解析：第五段最后一句话。原文的意思是：氢和氧这两种原子有同位素，最重的雨会首先降下来，结果导致太平洋洋面上形成的雨会在离海岸较近的加利福尼亚州先降下来（此时的雨比较重，是含大原子量同位素的水），而轻一点的雨会等到更内陆的地方比如犹他州再降下来。原文说的heavier rainfall很容被误解成事more rainfall，但这里不是，heavier指的就是雨水的分子量重，而不是雨多。A的干扰性很大。C错得比较明显，因为原文说了氢氧原子是稳定的，而且也并没有把这里的水的稳定性和别的地区作比较，属于自相矛盾。D项文中未提到，故选B。4. What did Cerling's team produce in their research?A) A map showing the regional differences of tap water. √B) A collection of hair samples from various barber shops.C) A method to measure the amount of water in human hair.D) A chart illustrating the movement of the rain system.答案：A解析：第七段第一句话。B选项为文中内容，但是答非所问，因为他们是用那个这些头发来验证这张地图，而并不是Cerling团队的产物。C, D选项在原文中都没有，故选A。5. What is the practical value of Cerling's research?A) It helps analyze the quality of water in different regions.B) It helps the police determine where a crime is committed.C) It helps the police narrow down possibilities in detective work. √D) It helps identify the drinking habits of the person under investigatio
C. 1. What is the scientists' new discovery?A) One's hair growth has to do with the amount of water they drink.B) A person's hair may reveal where they have lived. √C) Hair analysis accurately identifies criminal suspects.D) The chemical composition of hair varies from person to person.答案：B解析：第一段，由第一段可知，B选项为其同义表达。A和D文中未提到。C选项首先错在了accurately这个词上，因为原文说的是roughly，这里是自相矛盾，故选B。2. What does the author mean by "You're what you eat and drink (Para. 3)"?A) Food and drink affect one's personality development.B) Food and drink preferences vary with individuals.C) Food and drink leave traces in one's body tissues. √D) Food and drink are indispensable to one's existence.答案：C解析：第二、三段，答案在第三段的上下文都可以看出，比较简单。A, B, D中都含有明显的无中生有的信息，而且还不是生词，很好排除，故选C。3. What is said about the rainfall in America's West?A) There is much more rainfall in California than in Utah.B) The water it delivers becomes lighter when it moves inland. √C) Its chemical composition is less stable than in other areas.D) It gathers more light isotopes as it moves eastward.答案：B解析：第五段最后一句话。原文的意思是：氢和氧这两种原子有同位素，最重的雨会首先降下来，结果导致太平洋洋面上形成的雨会在离海岸较近的加利福尼亚州先降下来（此时的雨比较重，是含大原子量同位素的水），而轻一点的雨会等到更内陆的地方比如犹他州再降下来。原文说的heavier rainfall很容被误解成事more rainfall，但这里不是，heavier指的就是雨水的分子量重，而不是雨多。A的干扰性很大。C错得比较明显，因为原文说了氢氧原子是稳定的，而且也并没有把这里的水的稳定性和别的地区作比较，属于自相矛盾。D项文中未提到，故选B。4. What did Cerling's team produce in their research?A) A map showing the regional differences of tap water. √B) A collection of hair samples from various barber shops.C) A method to measure the amount of water in human hair.D) A chart illustrating the movement of the rain system.答案：A解析：第七段第一句话。B选项为文中内容，但是答非所问，因为他们是用那个这些头发来验证这张地图，而并不是Cerling团队的产物。C, D选项在原文中都没有，故选A。5. What is the practical value of Cerling's research?A) It helps analyze the quality of water in different regions.B) It helps the police determine where a crime is committed.C) It helps the police narrow down possibilities in detective work. √D) It helps identify the drinking habits of the person under investigatio
D. 1. What is the scientists' new discovery?A) One's hair growth has to do with the amount of water they drink.B) A person's hair may reveal where they have lived. √C) Hair analysis accurately identifies criminal suspects.D) The chemical composition of hair varies from person to person.答案：B解析：第一段，由第一段可知，B选项为其同义表达。A和D文中未提到。C选项首先错在了accurately这个词上，因为原文说的是roughly，这里是自相矛盾，故选B。2. What does the author mean by "You're what you eat and drink (Para. 3)"?A) Food and drink affect one's personality development.B) Food and drink preferences vary with individuals.C) Food and drink leave traces in one's body tissues. √D) Food and drink are indispensable to one's existence.答案：C解析：第二、三段，答案在第三段的上下文都可以看出，比较简单。A, B, D中都含有明显的无中生有的信息，而且还不是生词，很好排除，故选C。3. What is said about the rainfall in America's West?A) There is much more rainfall in California than in Utah.B) The water it delivers becomes lighter when it moves inland. √C) Its chemical composition is less stable than in other areas.D) It gathers more light isotopes as it moves eastward.答案：B解析：第五段最后一句话。原文的意思是：氢和氧这两种原子有同位素，最重的雨会首先降下来，结果导致太平洋洋面上形成的雨会在离海岸较近的加利福尼亚州先降下来（此时的雨比较重，是含大原子量同位素的水），而轻一点的雨会等到更内陆的地方比如犹他州再降下来。原文说的heavier rainfall很容被误解成事more rainfall，但这里不是，heavier指的就是雨水的分子量重，而不是雨多。A的干扰性很大。C错得比较明显，因为原文说了氢氧原子是稳定的，而且也并没有把这里的水的稳定性和别的地区作比较，属于自相矛盾。D项文中未提到，故选B。4. What did Cerling's team produce in their research?A) A map showing the regional differences of tap water. √B) A collection of hair samples from various barber shops.C) A method to measure the amount of water in human hair.D) A chart illustrating the movement of the rain system.答案：A解析：第七段第一句话。B选项为文中内容，但是答非所问，因为他们是用那个这些头发来验证这张地图，而并不是Cerling团队的产物。C, D选项在原文中都没有，故选A。5. What is the practical value of Cerling's research?A) It helps analyze the quality of water in different regions.B) It helps the police determine where a crime is committed.C) It helps the police narrow down possibilities in detective work. √D) It helps identify the drinking habits of the person under invesation.
微信支付 
支付宝支付