单选题 Questions 17—20 are based on the following monologue.

单选题Why did many countries of the South send students to the developed countries?

单选题Summer holiday camps (夏令营) for children began in the USA over sixteen years ago. Today there are (41) than 8,000 summer camps in the United States and every year (42) . four million children pass through their gates (43) June and August. Some (44) by bus every day from the nearest town. (45) stay as campers for one or two weeks. Quite a lot of children go off to camp (46) the whole of the summer holiday. The people there are young and (47) There is good food and lots of interesting things (48) . In many camps children learn things (49) cooking and drawing pictures. Every evening there are camp fires and games. Everyone goes to bed (50) but happy.

单选题On what occasion will people notice the importance of nonverbal communication, according to the passage?

单选题Questions 17～20 are based on the following talk about Christmas. You now have 20 seconds to read Questions 17～20.

单选题 {{I}} Questions 17—20 are based on the following text about energy. You now have 20 seconds to read Questions 17—20.{{/I}}

单选题[此试题无题干]

单选题Although there had been an astonishing variety of small cameras developed, it was not until George Eastman introduced the Kodak in 1888 that the mass appeal of photography seized America and Europe and thereafter spread quickly to the far corners of the earth. Eastman called his new famous camera the Kodak for no particular reason except that he liked the word. It was easy to remember and could be pronounced in any language. An immediate consequence of Eastman's invention was a blizzard of amateur photographs that soon became known as snapshots. The word was borrowed from hunters' jargon. When a hunter fired a gun from the hip, without taking careful aim, it was described as a snapshot. Photographers referred to the process of taking pictures as shooting, and they would take pride in a good day's shoot the way country gentlemen would boast about the number of birds brought down in an afternoon. The Kodak made photography not only easy but fun. Almost overnight photography became one of the world's most popular hobbies. A new and universal folk art was born; the showing of one's latest pictures and the creation of family albums became popular social pastimes. Camera clubs and associations numbered their members in the millions. One ardent amateur was the French novelist Emile Zola, who took innumerable photographs of his family, friends, and travels. Interviewed about his favorite hobby in 1900, he observed, "In my opinion you cannot say you have thoroughly seen anything until you have got a photograph of it." "The little black box", as the Kodak was affectionately dubbed, revolutionized the way people communicated. "A picture is worth a thousand words" was the claim and there were literally billions of pictures. In one year alone — 1988, the centenary of the invention of the Kodak — it is estimated that close to thirty billion were taken in the United States alone. The impact of the sale of photographic equipment on the economy is equally mind-boggling. Photography has played an essential role in the media revolution. It has vastly enhanced our ability to convey information, so that the concept of the global village has become a commonplace. Photographs have immeasurably extended our understanding of and compassion for our fellow human beings. Did Mr. Eastman have the faintest idea of the power residing in his "little black box"?

单选题Polarized light is a probably phenomenon characterized by its ______.

单选题By saying "this flurry of righteousness", the author points to ______.

单选题Freight costs were reduced to 10% of what they had been because of ______.

单选题Surgeons are using robotic systems to perform an ever-growing list of operations, not because the machines save money ______, thanks to the greater precision of robots, the patients recover in less time and have fewer complications. A. not because B. but C. but because D. but for