单选题Generally_________, that city is less crowded than the others in the same area.

单选题Life on the planet Jupiter is a possibility which ______.

单选题Everyone needs to sleep. If we don't sleep enough, we often feel tired and irritable (易怒的).It seems there are two purposes of sleep: physical rest and emotional rest. We need to rest our bodies and our minds. Both are important in order for us to be healthy. Each night we alternate (交替) between two kinds of sleep: active sleep and passive sleep. The passive sleep gives our body the rest that is needed, and prepares us for active sleep, in which dreaming occurs. In passive sleep, the body is at rest. The heart slows down. The body processes become very slow. We move very little. And the brain becomes very inactive. If a person continues to sleep, she or he enters a new stage, a more active stage. The body goes thro, gh several changes: the brain temperature rises, the amount of blood in brain increases, the body becomes very still and the brain becomes active. And as the brain becomes more active, the eyes begin to move rapidly, and the person is dreaming. Throughout the night, people alternate between passive and active sleep. During eight hours of sleep, people dream for a total of one and a half hours on the average. Many people say that they don't dream, or that they rarely dream. Doctors have studied the sleep cycles (周期)and have found that everyone dreams—in fact, that everyone needs to dream in order to rest his or her mind.

单选题Once lost______. A. it is hard to get such a chance again B. to get such a chance will be difficult C. one can never get such a chance again D. such a chance might never come again

单选题Ever since he______ his job, Allen has been much happier than before. A. changed B. had changed C. has changed D. changes

单选题Last week he promised that he ______ today, but he hasn't arrived yet.

单选题______ of the river has been polluted.

单选题He had to ______ life in the city because his father needed help on the farm.

单选题Whatdoesthespeakermainlytalkabout?A.Theuniversitylibrary.B.Thelibraryrules.C.Thelibraryhours.

单选题In 1941,when my father joined the U. S. Army, he was told that, on a written test, he had showed (36) for preparing food. Army officials offered him a course in becoming a cook. My father (37) because he thought he could (38) the battles, is things turned out, he got good (39) and became head cook of an army kitchen. All went well 40 he had to deal with spinach (菠菜). Because spinach is good for health, the army (41) it several times per week. (42) , the soldiers refused (43) to look at spinach on their plates. After hours of cooking spinach, my father (44) that, at the end of the meal, he was throwing all of it away. To save time and effort, he decided simply to throw away the (45) vegetable before it was cooked. One day an army officer saw the (46) spinach in the rubbish. He blamed my father, (47) that he was destroying government property (财产). (48) my father explained that he was simply (49) the army the trouble of cooking the unwanted vegetable, the army officer insisted on (50) him by taking five dollars from his pay for the next three months. Later, one officer told him that fresh spinach was government property, but cooked spinach was not. (51) if the spinach were cooked, it (52) be thrown out. From then on, my father (53) all the spinach and then immediately (54) it into a rubbish can to keep everyone (55) . The govern-ment did not have its property thrown out, and the soldiers did not have spinach on their plates.

单选题He was only an office boy before______the position.[A] being appointed[B] appointed[C] appointing[D] having appointed

单选题The astronauts ______ returning from the moon to the earth according to the plan.

单选题In the writer's real opinion, Kanai

单选题I phoned him twice and ______ messages, but he never returned my call. A. kept B. dropped C. received D. left

单选题He will surely finish the job on time if he ______ to do it in his own way. A. is leaving B. will leave C. leaves D. is left

单选题Sometime in the next century, the familiar early-newspaper on the front gate will disappear. And instead of reading your newspaper, it will read to you. You"ll get up and turn on the computer newspaper just like switching on the TV. An electronic voice will distribute stories about the latest events, guided by a program that selects the type of news you want. You"ll even get to choose the kind of voice you want to hear. Want more information on the brief story? A simple touch makes the entire text appear. Save it in your own personal computer if you like. These are among the predictions from communication experts working on the newspapers of the future. Pictured as part of broader home-based media and entertainment systems, computer newspapers would unite print and broadcast reporting, offering news and analysis with video images of news events. Most of the technology is available (可用的) now, but convincing (说服) more people that they don"t need paper to read a newspaper is the next step. But resistance to computer newspapers may be stronger from within journalism. Since it is such a cultural change, it may be that the present generation of journalists and publishers will have to die off before the next generation realize that the newspaper industry is no longer a newspaper industry. Technology is making the end of traditional newspapers unavoidable. Despite technological advances, it could take decades to replace newsprint with computer screens. It might take 30 to 40 years to complete the changeover because people need to buy computers and because newspapers have established financial(财经的)interests in the paper industry.

单选题Although Helen is a new teacher, she knows ______ student in her class.[A] every of[B] every[C] all[D] all of

单选题Insects live ______.