Read the 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 ly 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 difference. 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 region 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 researches. 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... Question: What is the practical value of Cerling's research? Options: A: It helps analyze the quantity 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.
C

Read the article and select the best answer. Article: Samantha, or Sam, as her husband, John, called her, had left the doctor's house looking perfect, satisfied with her appearance. The year was 1862. It seemed that the war with the North would never come to an end. Sam's father had left as soon as possible, swearing that he'd fight for Virginia, for their land, for their new government, for God, for the South. At last, Samantha reached the house that she and John owned. It was a cold, rainy night, and she was glad to be home. She stepped into the sitting room. John rested in an armchair, reading a book. He glanced at her, put the book down, and stood, reaching his arms out for her. They kissed briefly. He put a hand to her now slightly round belly and asked, "What did the doctor say?" "He said the baby was fine and that I seemed healthy. Do you have any news?" "Surprisingly, yes." John hesitated for a moment, as if deciding how he would phrase what he was about to say, and then unwillingly continued, "I've been demanded to join the army." Sam screamed, "What?" She was near tears. "But-but we're just starting out." Her voice shook. "I thought that after two years of begging my mother to let the two of us get married that our life would finally be happy. Isn't there any way you can get out of this?" John answered, "I'm afraid not." "Please. Please, John, if you love me, please get out of this. Break a leg, fake an illness, do something." She began to sob. John comforted her, resting her head on his shoulder. "Sam." "What?" "Name the child after me; name it John or Joanna. I'll come back as soon as I can. I promise." Sam smiled into his collar bone, knowing that John lived by his word. He never broke a promise. She pressed her hand to her belly, and, unknown to her, the baby was a girl. And unknown to both of them, the promise that John had just made would be the only promise he would ever break. Question: Which of the following statements is TRUE? Options: A: Sam's father had been dead for some time. B: Sam's mother lived in the North on her own. C: A new government was set up in the South. D: The South was attacked by foreign countries.
C

Read the article and select the best answer. Article: Experts do not really know when people began keeping fish as pets. But they say that people have been interested in fish for thousands of years. Some say the ancient Sumerians were the first civilization to keep fish in ponds more than four thousand years ago. The Chinese kept and studied carp and goldfish more than one thousand years ago. The ancient Romans kept eels as pets. And the Greek philosopher Aristotle made what is believed to be the first known study of sea life, including sharks and dolphins. Keeping fish at home in small water tanks called _ is extremely popular today. And everyone seems to enjoy visiting huge public aquariums that have opened around the world. By the middle of the eighteen hundreds, science had shown that plants, fish and other sea creatures could survive together under water. So it was no longer necessary to change the water in a tank for the fish to live there. This led to the building of the first public aquariums. The first aquariums opened in London, England in 1853. in the next fifteen years, other aquariums opened in Europe and the United States. By 1928, there were about forty-five public aquariums. The Monterey Bay Aquarium has been recognized as the first aquarium in the United States and it shows visitors the underwater life in the bay. The Georgia Aquarium opening in 2005 says it is the largest in the world. It has more than one hundred thousand sea animals in thirty million liters of water including two whale sharks---the world's largest fish. Another aquarium re-opened in 2005 in Camden, New Jersey. The Adventure Aquarium first opened in 1992. It spent about fifty million dollars expanding its building and improving its exhibits. Aquariums provide the public with many chances to experience life under the sea. They can be found in most areas of the world. People might even want to start an aquarium at home and join the millions of people around the world who keep fish as pets. Question: Which aquarium opened again after its rebuilding ? Options: A: The Monterey Bay Aquarium. B: The Adventure Aquarium. C: The Georgia Aquarium. D: The first aquarium in London.
B