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... What does the author mean by "You're what you eat and drink" (Line 1, 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 essential to one's existence.
C
(Question)
So you have been called for an interview---well done?Your effort has been paid off? You will feeI better at the interview if you show an understanding of the nature of the organization. Ask someone who already does it,or check it with one of the advisers. Ask a member of your family or a friend to act as the employer and to give you an unreal interview.Be as realistic as possible,answer the questions seriously.Afterwards discuss how it went.Think about how the employer would prefer to see your look.Remember---the majority of employers are over 30. It is not wise to rush out and buy new clothes.which will be worn for the first time at the interview.You'll feel more at ease in a familiar dress. Carelessness in any of these could cost you the job.Arrive at least 15 minutes before time,this will give you a chance to have a look around,read the notice board and get the feel of the place.Being late at the interview produces a bad impression.The first impression that the interviewer gets of you is formed as you walk through the door,so take a couple of deep breaths. Be ready to shake hands if the interviewer offers. Don't take a seat until asked.Then sit comfortably. Make eye contact when you are greeted and again if you shake hands.And during questioning,eye contact is a form of non-verbal greeting. Remember the interviewer's name and use it from time to time. Be ready for the question "Is there anything you want to ask?" Before the interview you should get ready for two or three such questions.Look on these not just as a chance to get information but as a means to give your employer a better impression.Asking can show knowledge but avoid asking about holidays,pensions and so on.It looks as if you are tired even before you begin.You can check on these later,when the hope for job is offered. And if you fail, look upon the interview as an experience in itself.Learn from it.We wish you good luck and good job hunting. Before you go to see the employer,you'd better_. A) find a dress you have got used to B) buy some modern shoes,ties,etc. C) have your hair cut D) put on your newly-bought clothes
(Answer)
A
Question: Many things -- genetics, environment, the food you eat, illness, sleep, even the seasons -- influence your emotional state. But at the heart of it is how you regard yourself. If you have a healthy level of self-esteem, you not only cope with life's challenges better than people with low self-esteem, but you're probably more content, confident, and successful. You're probably also healthier. Studies show that positive self-esteem actually helps inoculate (......) people against depression and anxiety, conditions that may present increased risk of everything from colds to heart diseases. Most people's good sense of worth is rooted in their childhood -- in the early approval of their parents, teachers, and friends. But as we get older, most of us judge ourselves by our sense of how effectively we're managing in the world, especially in the areas of love and work. Our ability to love and to be loved can give us a sense of purpose and deep fulfillment. We can also find satisfaction and pride in work-related accomplishments and the people we meet and work with can reinforce our sense of self and our role in life. Once midlife comes along, however, our self-esteem can take a turn in response to changes in our lives. Marital relationship may change, children may leave home , and we may begin to scale back our work as we approach retirement. Of course, the view in the mirror may not be what it used to be, either. If you find your self-esteem eroding a bit, try to build it up again. As the saying goes, it's better to try something and fail than to be successful at not trying anything . Focus on goals that are linked to activities you're really interested in, so you'll enjoy a sense of purpose and gain pleasure from the pursuit whether or not you achieve your goal in full. The author wrote the article to _ A) criticize some scientists' new ideas B) suggest developing healthy self-esteem C) advise struggling for great ideas. D) recommend ways to avoid diseases
Answer:
B