Read the following article and select the best answer. Article: As skies are filled with millions of migrating birds, European scientists say the seasonal wonder appears to be strange: The fatter the bird, tile better it flies. The results of their study led to a theory opposite to a central one of aerodynamics , which says that the power needed to fly increases with weight. For birds, obviously, the cost of flying with heavy fat is much smaller than we used to think. Researchers found that red knot wading birds double their normal body weight of 100 grams before making their twice-a-year nonstop flight between the British Isles and the Russian Arctic. Distance: 5,000 kilometers. Another study in the magazine Nature measured the advantage of flying in an aerodynamic group which allows birds to save energy by flying smoothly and quietly in the lead bird' s air stream. Flying in groups, their heart rates were 14.5 percent lower than flying alone, according to Henri, a French scientist. The findings help explain how birds complete difficult migrations. Researchers had thought that thinner, stronger birds would have the best chance to survive. The first study suggests that building up fat to be burnt as fuel during the migration is worth more than the energy it takes to carry the additional weight. In the study, researchers said their team studied the birds flown at different body weights during 28 simulated flights. They forced a small amount of special water into the birds' bodies so that they could measure the amount of energy burnt during the flight. Question: During their migrating flight, red knot wading birds can save energy by flying - separately - alone - in groups - in pairs
in groups

(Question)
Read the following article and select the best answer. Article: High-quality customer service is preached by many, but actually keeping customers happy is easier said than done. Shoppers seldom complain to the manager or owner of a retail store , but instead will warn their friends, relatives, co-workers, strangers and anyone who will listen. Store managers are often the last to hear complaints. "Storytelling hurts retailers and entertains consumers," said Paula Courtney, President of the Verde group. "The store loses the customer, but _ ." The most common complaints include filled parking lots, cluttered shelves, overloaded racks, out-of-stock items, long check-out lines, and rude sales people. During peak shopping hours, some retailers solved the parking problems by getting moonlighting local police to work as parking attendants to direct customers to empty parking spaces. Retailers can relieve the headaches by redesigning store display, pre-stocking sales items, hiring speedy and experienced cashiers, and having sales representatives on hand to answer questions. Most importantly, sales people should be skillful and polite with angry customers. "Retailers who're enthusiastic and friendly are more likely to smooth over issues than those who aren't so friendly." said Professor Stephen Hoch. "Maybe something as a greeter at the store entrance would help." Customers can also improve future shopping experiences by filling complaints to the retailer, instead of complaining to the rest of the world. Retailers are hard-pressed to improve when they have no idea what is wrong. Question: To achieve better shopping experiences, customers are advised to _ . - voice their dissatisfaction to store managers directly - settle their disagreements with stores in a friendly way - put pressure on stores to improve their service - shop around and make comparisons between stores
(Answer)
voice their dissatisfaction to store managers directly

Ques: Read the following article and select the best answer. Article: A few years ago, in one experiment in behavioural psychology, Stanley Milgram of Yale University tested 40 subjects for their willingness to obey instructions given by a "leader" in a situation in which the subjects might feel a personal dislike of the actions they were called upon to perform. Specifically, Milgram told each volunteer "teacher-subject" that the experiment was in the noble cause of education, and was designed to test whether or not punishing pupils for their mistakes would have a positive effect on the pupils' ability to learn. The teacher-subjects were placed before a panel of thirty switches with labels ranging from "15 volts of electricity (slight shock)" to "450 volts (danger -- severe shock)" in steps of 15 volts each. The teacher-subject was told that whenever the pupil gave the wrong answer to a question, a shock was to be administered. The supposed "pupil" was in reality an actor hired by Milgram to pretend to receive the shocks by giving out cries and screams. Milgram told the teacher-subject to ignore the reactions of the pupil, and to administer whatever level of shock was called for. As the experiment unfolded, the "pupil" would deliberately give the wrong answers to questions, thereby bringing on various electrical punishments, even up to the danger level of 300 volts and beyond. Many of the teacher-subjects _ administering the higher levels of punishment, and turned to Milgram. In these situations, Milgram calmly explained that the teacher-subject was to carry on with the experiment and that it was important for the sake of the experiment that the procedure be followed through to the end. What Milgram was trying to discover was the number of teacher-subjects who would be willing to administer the highest levels of shock, even in the face of strong personal and moral revulsion against the rules and conditions of the experiment. Before carrying out the experiment, Milgram explained his idea to a group of 39 psychiatrists and asked them to predict the average percentage of people... Question: Before the experiment took place the psychiatrists _ . - believed that a shock of 150 volts was unbearable - failed to agree on how the teacher-subjects would respond to instructions - under-predicted the teacher-subjects' willingness to follow experimental procedure - thought that many of the teacher-subjects would administer a shock of 450 volts
Ans: under-predicted the teacher-subjects' willingness to follow experimental procedure

Read the following article and select the best answer. Article: Why should you learn Sign Language? Do you want to improve your communication with a family member or friend who is deaf? Do you want to be able to communicate with deaf people in general? Would you like to advance in your career by being able to communicate in ASL? Do you want to be a Sign Language interpreter? Sign language is not just a random collection of gestures but a full-blown language in its own right, complete with its own grammatical rules. Each country or region has its own sign language, as different from each other as English is from Spanish. Each version of sign language is somewhat linked to the spoken language in its region. For example, American sign language does share similarities with English, even though it is its own language. The advantages of knowing sign language in addition to a spoken language are many. Communication becomes possible on many levels with the deaf community, with other people either hearing or not in any of the above situations, as well as many more. While other languages take years to learn, American Sign Language can be taught in a much shorter time period. It is one of the easiest languages to learn because most of the signs were developed to mimic the actual word or phrase it is representing. Even the alphabet signs look like the letters of the English alphabet. American Sign Language, or ASL, is the third most used language in the United States. Used by the deaf community, interpreters, and friends and family of the deaf. There are a lot of sites on the internet that not only shows you the sign with video, but will help you practice reading signs as well. Teaching even hearing babies sign language seems to be the fashion in recent years and for good reason. Communicating in sign language is fun and natural as babies naturally use body gestures in early communication. Teaching baby sign language actually appears to enhance the learning of verbal skills and brain development of the children involved. Question: Which of the following topics is not discussed in the passage? - What is sign language? - The advantages of knowing sign language. - The relation of American sign language and English. - Ways of learning sign language.
Ways of learning sign language.