Read the following article and select the best answer. Article: Scientists have devised a way to determine roughly where a person has lived using a strand 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 your hair," said Thure Cerling, a geologist at the University of Utah. While U.S 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 . 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 U.S. 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 rain systems. "It's not good for pinpointing ," 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... Question: What is the practical value of Cerling's research? - It helps analyze the quality of water in different regions. - It helps the police determine where a crime is committed. - It helps the police narrow down possibilities in detective work. - It helps identify the drinking habits of the person under investigation.
It helps the police narrow down possibilities in detective work.

Read the following article and select the best answer. Article: "Enough" with the multivitamins already. That's the message from experts behind three new studies that tackled an often debated question: Do daily multivitaminsmake you healthier? "We believe that the case is closed - supplementing the diet of well-nourished adults with (most) mineral or vitamin supplements has no clear benefit and might even be harmful," concluded the authors of the editorial summarizing the new research papers. They urge consumers to not 'waste' their money on multivitamins. "The 'stop wasting your money' means that perhaps you're spending money on things that won't protect you long term," editorial co-author, Dr. Edgar Miller said, "What will protect you is if you spend the money on fruits, vegetables, nuts, beans, low fat dairy, and things like that. Exercising would probably be a better use of the money." The strong message was based on a review of the findings from three studies that tracked multivitamins link to cancer protection, heart health, and brain and cognitive measures. The first study looked at vitamin supplementation's role in preventing chronic disease. The next study looked at whether long-term use of multivitamins would have any effect on slowing cognitive decline. The third study looked specifically at multivitamins and minerals role in preventing heart attack. "The three studies found no difference in rates of chronic disease, heart attack and the need for hospitalization between vitamin-takers and placebo -takers." Dr. Edgar Miller stated. One expert agreed some nutrient-deficient people may still benefit from multivitamins. "There might be an argument to continue taking a multi(vitamin) to replace or supplement your not healthy diet," Dr. Edgar Miller added. He also notes that vitamins can benefit people with celiac disease and those who are pregnant. Question: This text is likely to be selected from a book of _ . - medicine - education - food - business
medicine

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Read the following article and select the best answer. Article: I went into Harrods in London (a huge department store I am sure you have heard of) to buy some Minton china plates for a wedding anniversary which was to be a group gift from friends to other friends in Geneva. Having only 30 minutes between meeting. I whizzed there in a taxi from the office and battled through the milling people on the 2nd day of the sales on the ground floor up to the 5th to the china department. There was a man standing there who was obviously a sales person who I rushed up to and asked if he had this particular china in stock and if it would take long to wrap, etc. He was amazing. He got the plates in seconds, wrapped them up and asked me if I wanted a store card, to which I replied no, because I lived in Switzerland, to which he replied asking if, as I lived abroad, would like a tax rebate form . After that he showed me what to do, produced a map of the store and told me where I should go for the formalities . That was fabulous! I thanked him and said what wonderful service he had given me. I even asked if he gave this to everyone, to which he answered: "I'm just doing what is required at Harrods". With that, a tall man in a gray suit approached me and offered his hand to shake mine saying, "Can I introduce myself? I am the Chief Executive of Harrods and what an interesting conversation I have just heard..." He had been wandering through the store (as you should do as a hands-on CEO) and had overheard me thanking this salesman, whose face, I can hardly describe, was frozen in a mixture of delight awe and astonishment! Can you imagine the salesman going home to his family and friends recounting what the CEO spoke to him after overhearing him being praised by a customer? Question: As soon as she bought what she wanted, the writer _ . - went to a meeting. - flew back to Geneva - visited one of her friends - attended a wedding ceremony
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went to a meeting.