Read the article and select the best answer. Article: In the mid-1950s, I was a somewhat bored early-adolescent male student who believed that _ . One day, this approach threw me into embarrassment In Mrs. Totten's eighth-grade math class at Central Avenue School in Anderson, Indiana, we were learning to add and subtract decimals . Our teacher typically assigned daily homework, which would be recited in class the following day. On most days, our grades were based on our oral answer to homework questions. Mrs. Totten usually walked up and down the rows of desks requesting answers from student after student in the order the questions had appeared on our homework sheets. She would start either at the front or the back of the classroom and work toward the other end. Since I was seated near the middle of about 35 students, it was easy to figure out which questions I might have to answer. This particular time, I had completed my usual two or three problems according to my calculations. What I failed to expect was that several students were absent, which threw off my estimate. As Mrs. Totten made her way from the beginning of the class,I desperately tried to determine which math problem I would get. I tried to work it out before she got to me, but I had brain freeze and couldn't function. When Mrs. Totten reached my desk,she asked what answer I'd got for problem No. 14. "I...I didn't get anything," I answered,and my face felt warm. "Correct," she said. It turned out that the correct answer was zero. What did I learn that day? First, always do all your homework. Second, in real life it isn't always what you say but how you say it that matters. Third,I would never make it as a mathematician. If I could choose one school day that taught me the most, it would be that one. Question: The author failed to get the questions he had expected because _ . Options: A: the class didn't begin as usual B: several students didn't come to school C: he didn't try hard to make his estimate D: Mrs. Totten didn't start from the back of the class
B

Read the article and select the best answer. Article: In many countries today,laws protect wildlife.In India the need for such protection was realized centuries ago. About 300 B.C.an Indian writer described forests that were somewhat like national parks today.The killing of game animals was carefully governed.Some animals were fully protected.Within the forest,nobody was allowed to cut trees,burn wood,or trap animals for their furs.Animals that became dangerous to human visitors were trapped or killed outside the park,so that other animals would not become uneasy. The need for wildlife protection is greater now than ever before.About a thousand sorts of animals are in danger of extinction,and the speed at which they are being destroyed has been _ .With mammals ,for example,the speed of extinction is now about one sort every year;from A. D.1 to 1800,the speed was about one sort every fifty years.Everywhere,men are trying to solve the problem of saving wildlife while caring for the world's growing population. Question: The growth of the world's population means _ . Options: A: greater danger to wild life B: people like animals better C: over a thousand sorts of animals are extinct D: only one sort of animal is extinct every year
A

Read the article and select the best answer. Article: Taking a picture of your tongue with a mobile phone could soon instantly tell you how healthy you are. Researchers believe the images can reveal important information about a patient's health and even give them early warning of serious illness. A team at the University of Missouri is developing a system that can analyze pictures using a 5,000-year-old Chinese principle, which is based on the flow and balance of positive and negative energies in the body, and uses the tongue as a key to learning about a person's physical health, or "zheng" according to Chinese medicine. "Within a year, our goal is to create an application for smart phones that will allow anyone to take a photo of their tongue and learn the status of their zheng," said Dong Xu, chair of MU's Computer Science Department in the College of Engineering and the co-author of the latest study. The software analyzes images based on the tongue's color and coating to distinguish between tongues showing signs of "hot" or "cold" zheng. Shades of red and yellow are associated with hot zheng, whereas a white coating on the tongue is a sign of cold zheng. "Hot and cold zheng doesn't refer directly to body temperature," said Xu, "Rather, it refers to a series of symptoms associated with the state of the body as a whole." For the study, 263 gastritis patients and 48 healthy volunteers had their tongues analyzed. The gastritis patients were classified by whether they showed infection by a certain bacteria as well as the intensity of their gastritis symptoms. In addition, most of the gastritis patients had been previously classified with either hot or cold zheng. This allowed the researchers to test the accuracy of the software's analysis. "Our software is able to classify people based on their zheng status. And as we continue to work on the software we hope to improve its ability," said another co-author Ye Duan, "Eventually everyone will be able to use this tool at home using webcams or smart phone applications, which will allow them to monitor their zheng and... Question: The study led by Dong Xu proves _ . Options: A: the effect of the software B: the software's great prospect C: the advancement of smart phones D: the greatness of Chinese medicine
A