Dogs have long been used to find explosives and drugs.Now,a new study shows that man's best friend can also help to find lung and breast cancer,researchers report in integrative Cancer Therapies.The findings show that trained ordinary household dogs can detect early--stage lung and breast cancers by smelling the breath samples of patients. Researchers have found that cancer cells send out molecules different from those of healthy ones,and that might be sensed by smell by the highly sensitive dog's nose. For the study,five dogs were trained by a professional instructor to respond differently to breath samples of healthy and cancer patients."The dogs learned to sit or lie down in front of cancer patient samples and to ignore control samples through the method of food reward," McCulloch explained. After a period of training,researchers tested the animals'ability to distinguish cancer patients from controls.The animals were given breath samples from 55 patients with lung cancer,3 1 with breast cancer and 83 healthy controls who were not included in the original training period. McCulloch's group found that the dogs were able to correctly distinguish the breath samples of cancer patients from those of the control subjects in about 90 percent of the cases.The dogs were also able to detecting early-stage lung and breast cancers. "These results show that there is hope for early detection,"McCulloch said.The re-searches are planning to conduct further studies on the breath composition of cancer patients to possibly design an electronic device that can do the dogs'job."A dog's nose is so powerful it can detect odors 10 000 to 100 000 times better than a human nose can.I hope people will be interested in doing this research,"McCulloch added,"It shows that there is definitely something out there." We can infer from the passage that_. A) dogs can smell signs of other cancers except the above two kinds B) the final goal of the researchers is to design an electronic dog to detect cancer C) dogs can detect odors 10 000 to 100 000 times better than humans can D) dogs will soon be widely used to smell signs of cancers in hospitals
B
French novelist Jules Verne (1828--1905) is often called the father of science fiction. Although he was not a great traveler himself, his characters travelled to the moon (inFrom the Earth to the Moon), under the sea (inTwenty thousand leagues under the sea), into a volcano (inA journey to the centre of the earth), around the world (inAround the World in Eighty Days) and to many other places. Jules Verne was born in the French city of Nantes in 1828. When he was a boy he ran away from home to work on a ship. However, his father soon found him and brought him home. After that he decided that any future travel he did would be in books. In 1847 his father sent Jules to Paris to study to be a lawyer. Even though he was busy writing, Verne passed his exams in 1849 with high marks. When Jules told his father he did not want to be a lawyer, his father was very angry. He stopped sending his son any money, so Jules had to earn a living by his writing. Over the next few years he wrote many stories and plays, which brought him only a little money. Then, in 1856, he met Honorine de Viane, a rich, young widow with two children. The couple married the next year. After his marriage, Verne worked as a businessman in Paris. However, he was not very successful at his job and spent most of his time writing books and doing research for the next one. In 1863 he published his novelFive Weeks in a balloonand the following year he publishedA Journey to the centre of the earthwhich made him famous. His books became so popular and earned him so much money that he was able to leave his job and work full time on his writing. In his Lifetime, Jules Verne wrote more than 50 books and he became a rich man. Many of this imaginative novels have been turned into films. Which of the following is true according to the passage? A) He was not good at his schoolwork. B) He went to Paris because he wanted to be a lawyer. C) His early stories and plays didn't bring in much money. D) He got married in 1856.
C
It all started at the beginning of this term. At first, Carmen wasn't really sure what was happening. In class, she had tosquint to see the blackboard clearly. As it got worse, she became more and more worried. It was important for her to see the notes and homework the teacher wrote on the board. In class, she asked for a desk that was closer to the blackboard. One day, her teacher said, "Carmen, I've noticed you squinting a lot. Are you having trouble seeing the board?" Carmen shook her head. "I'm fine, Mrs. Cruz." At home, she had to sit closer and closer to the television. Her mother noticed her squinting as she watched her favorite shows. "Tomorrow I will go to see a doctor," she said firmly. Three days later, Carmen had new glasses. She was told to wear them all the time. "All of the kids at school will think I am anerd ," she said. "You look just as beautiful with those glasses on as you do without them," her mother said. But Carmen didn't believe her. The next day, Carmen kept the glasses in her pocket as she walked into the schoolyard. Suddenly, she heard her friend Theresa shout. "What's wrong?" she asked. "My silver ring is gone!" Theresa cried. Carmen could tell that Theresa was very upset. They all looked for the ring in the grassy area of the playground. Carmen realized that she could search better if she could see better. She took the glasses out of her pocket and put them on. Everything looked so different! So clear! And aglimmer of silver caught her eye. "Here it is," she shouted. "Thanks Carmen," Theresa said. "I didn't know you wore glasses. They look great!" "Thanks," Carmen replied shyly. As they walked back toward the school building, two more girls praised her glasses. Carmen smiled. "Maybe wearing glasses won't be so bad after all," she thought. The purpose of the text is to tell readers _ . A) how to protect their eyes B) never to make fun of others C) things aren't always as bad as we expect D) it is necessary to give a hand to those in trouble
C