单选题 Only if you work hard every day ______ pass the exam.

单选题 'What's your opinion of our teacher's new painting?' 'It would seem to me that it's ______ his usual standard.'

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单选题 A large number of people in the world eat fast food. Whenever you go into a fast food restaurant, you can see lots of people enjoying their meals there. But do you know in which country people like fast food best? The English people are the world's biggest fans of fast food, while the French are the least interested in quick meals, according to a survey done last year. The survey of thirteen countries shows 45% of the English people say they can't give up fast food because it's delicious. And 44% of Americans and 37% of Canadians say the same. The French, proud of their delicious cuisine, don't like fast food. 81% of them think it is unhealthy, followed by 75% of the Japanese. How about the Chinese? How often do you have hamburgers or fried chicken? It doesn't matter whether you like western fast food or Chinese food. The most important thing is to keep a balanced diet.

单选题 In ancient times the most important exams were spoken, not written. In the schools of ancient Greece and Rome, testing usually consisted of saying poetry aloud or giving speeches. In the European universities of the Middle Ages, students who were working for advanced degrees had to discuss questions in their field of study with people who had made a special study of the subject. This custom exists today as part of the process of testing candidates for the doctor's degree. Generally, however, modern examinations are written. The written examination, where all students are tested on the same into existence with the great increase, was probably not known until the nineteenth century. Perhaps it came into existence with the great increase in population and the development of modern industry. A room full of candidates for a state examination, timed exactly by electric and carefully watched over by managers, resembles a group of workers at an automobile factory. Certainly, during examinations teachers and students are expected to act like machines. One type of test is sometimes called as 'objective' test. It is intended to deal with facts, not personal opinions. To make up an objective test, the teacher writes a series of questions each of which has only one correct answer. Along with each question the teacher writes the correct answer and also three statements that look like answers to students who have not learned the material properly.

单选题 The clock has stopped. I ______ get it go again and set the alarm, or I will be late again tomorrow.

单选题 When he was in his ______, he began to study English.

单选题Thenumber of speakers of English in Shakespeare′s time is estimated to have beenabout five million.Today it is estimated that some 260 million people speak itas aan21language,mainlyin the United State

单选题 I'd like to find someone ______ I can discuss such a problem.

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单选题 A completely new situation will ______ when the examination system comes into existence.

单选题 Could you hold on a few minutes ______ I check this with my boss?

单选题 When another old cave is discovered in the south of France, it is not usually news. Rather, it is an ordinary event. Such discoveries are so frequent these days that hardly anybody pays heed to them. However, when the Lascaux cave complex was discovered in 1940,the world was amazed. Painted directly on its walls were hundreds of scenes showing how people lived thousands of years ago. The scenes show people hunting animals, such as bison or wild cats. Other images depict birds and, most noticeably, horses, which appear in more than 300 wall images, by far outnumbering all other animals. Early artists drawing these animals accomplished a monumental and difficult task. They did not limit themselves to the easily accessible walls but carried their painting materials to spaces that required climbing steep walls or crawling into narrow passages in the Lascaux complex. Unfortunately, the paintings have been exposed to the destructive action of water and temperature changes, which easily wear the images away. Because the Lascaux caves have many entrances, air movement has also damaged the images inside. Although they are not out in the open air, where natural light would have destroyed them long ago, many of the images have deteriorated and are barely recognizable. To prevent further damage, the site was closed to tourists in 1963,23 years after it was discovered.

单选题What we must do now__make a careful investigation on the circumstances.

单选题 ______ the university is by examination only.

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单选题 It is a fact ______ most deaths from lung cancer are caused by smoking.

单选题 First, the spotted owl was threatened by logging in the Pacific Northwest. Now it's in danger from a new enemy, the barred owl. Barred owls have been moving to the Northwest from the eastern part of the United States. Stan Sovern has studied spotted owls. Now when he calls for spotted owls, barred owls are starting to appear. Sovern threw a mouse on the ground, and a barred owl grabbed it. Scientists have learned that spotted owls start to vanish when barred owls come. Some barred and spotted owls have mated and produced hybrid babies. One spotted owl was killed by a barred owl. Professor Ned K. Brown of the University of California-Berkeley says, 'In some areas of Washington, the barred owls moved into very dense, deep woods. The same kind of woods that are opened up, or destroyed by logging, that adversely influences the spotted owls.' Ten years have passed since the federal government began protecting the spotted owl. Loggers were forced to limit logging on seven million acres of government land. No one is sure how the arrival of the barred owls will impact laws that protect spotted laws. The barred owls like to live in the deep forests where loggers like to cut down trees. The barred owls will likely keep migrating to the Northwest.

单选题 Which of your two hands do you use much better? Very few of us can use both of our hands equally well. Most of us are right-handed. Only about five people out of a hundred are left-handed. Newborn babies can grasp objects with either of their hands, but in about two years they usually prefer to use their right hands. Scientists don't know why this happens. They used to think that we inherited this tendency from our animal ancestors, but this may not be true. Monkeys are our closest relatives in the animal world. Scientists have found that monkeys prefer to use one of their hands more than the other, but it can be either hand. There are as many right-handed monkeys as there are left-handed ones. Next time you visit the zoo, watch the monkeys carefully. You'll see that some of them will prefer to swing from their right hands, and others will use their left hands. But most human beings use their right hands better, and this makes life difficult for those who prefer to use their left hands.

单选题 Whatever you do, don't challenge a chimpanzee named Ayumu to a number memory game. In 2007, Ayumu became famous for his lightning speed at a game that goes like this: A player views a computer screen where the numbers 1 through 9 appear briefly at once and then turn to white squares. The player then taps the squares where the numbers had been, in order from 1 to 9. People can do it. But no human competitor has ever completed the game faster or more accurately than Ayumu the chimp. For almost five years Ayumu remains undefeated. Psychologist Nicholas Humphrey of Darwin College at Cambridge University in England now thinks he knows the secret behind the chimp's ability. Humphrey suspects Ayumu's brain may have a condition that allows the chimp to see numbers as colors. This would mean that Ayumu may see a color glow after the number disappears. Then, instead of remembering the numbers, he remembers a sequence of colors, each associated with a number. The condition that Humphrey believes Ayumu may have is called synesthesia. Humans with synesthesia may associate numbers and letters with colors. For example, a person may see the number '5' as the color blue. Until now, scientists had assumed only humans could have synesthesia. Humphrey found the inspiration for his idea at a 2011 scientific conference. There, he heard a presentation about Ayumu's memory abilities and another talk about synesthesia. He then put the two ideas together. Not everyone is convinced that Humphrey is correct. Primatologist Tetsuro Matsuzawa of the Primate Research Institute at Kyoto University in Japan has spent decades studying the amazing memories of chimpanzees, including Ayumu. He maintains that chimps simply have faster memory recall than people.