单选题Greeley's injunction "Go West, young man?" resulted in a massive migration of population, with people occupying land ______ no one held title of ownership and that had yet to be sold.

单选题The President______the public that taxes would not be increased after the election.

单选题The world's population continues to grow. There now are about 4 billion of us on earth. That could reach 6 billion by the end of the century and 11 billion in another 75 years. Experts long have been concerned about such growth Where will we find the food, water, jobs, houses, schools and health care for all these people? A major new study shows that the situation may be changing. A large and rapid drop in the world's birth rate has taken place during the past 10 years. Families generally are smaller now than they were a few years ago. It is happening in both developing and industrial nations, Researchers said they found a number of reasons for this. More men and women are waiting longer to get married and are using birth control devices and methods to prevent or delay pregnancy. More women are going to school or working at jobs away from their homes instead of having children. And more governments, especially in developing nations, now support family planning programs to reduce population growth. China is one of the nations that has made great progress in reducing its population growth. China has already cut its rate of population growth by about one half since 1970. China now urges each family to have no more than one child. And it hopes to reach zero population growth, the number of births equaling the number of deaths, by the year 2000. Several nations in Europe already have fewer births than deaths. Experts said that these nations could face a serious shortage of workers in the future. And the persons who are working could face much higher taxes to help support the growing number of retired people.

单选题After a concert tour in Asia, Canada and the U.S., he will ______ work on a five-language opera.(2002年中国社会科学院考博试题)

单选题They applied for a ______ of 40,000 to buy a house.

单选题The passage provides information to answer which of the following questions?

单选题To many people, a husband and wife alone do not seem a proper family—they need children to enrich the circle, to ______ family character and to gather the redemptive influence of offspring.

单选题It is reported that the worst pedestrian {{U}}jam{{/U}} in this city occurs around this crossroads.

单选题2 For laymen ethnology is probably the most interesting of the biological sciences for the very reason that it concerns animals in their normal activities and therefore, if we wish, we can assess the possible dangers and advantages in our own behavioral roots. Ethnology also is interesting methodologically because it combines in new ways very scrupulous field observations with experimentations in laboratories. The field workers have had some handicaps in winning respect for themselves. For a long time they were considered as little better than amateur animal-watchers--certainly not scientists, since their facts were not gained by experimental procedures: they could not conform to the hard-and-fast ruie that a problem set up and solved by one scientist must be tested by other scientists, under identical conditions and reaching identical results. of course many situations in the lives of animals simply cannot be rehearsed and controlled in this way. The fall flocking of wild free birds can't be, or the homing of animals over long distances, or even details of spontaneous family relationships. Since these never can be re produced in a laboratory, are they then not worth knowing about? The ethnologists who choose field work have got themselves out of this impasse by greatly refining the techniques of observing. At the start of a project all the animals to be studied are live-trapped, marked individually, and released. Motion pictures, often in col or, provide permanent records of their subsequent activities. Recording of the animals' voices by electrical sound equipment is considered essential, and the most meticulous notes are kept of all that occurs. With this material other biologists, far from the scene, later can verify the reports. Moreover, two field observers often go out together, checking each other's observations right there in the field. Ethnology, the word, is derived from the Greek ethos, meaning the characteristic traits or features which distinguish a group--any particular group of people or, in biology, a group of animals such as a species. Ethnologists have the intention of studying "the whole sequence of acts which constitute an animai's behavior. " In abridged dictionaries ethnology is sometimes defined simply as "the objective study of animal behavior," and ethnologists do emphasize their wish to eliminate myths.

单选题The detective and his assistant have begun to ______ the mysterious murder. A. look into B. see to C. make over D. come through

单选题Many theories concerning the causes of juvenile delinquency ( crimes committed by young people) focus either on the individual or on society as the major contributing influence. Theories (21) on the individual suggest that children engage in criminal behavior (22) they were not sufficiently penalized for previous misdeeds or that they have learned criminal behavior through (23) with others. Theories focusing on the role of society suggest that children commit crimes in (24) to their failure to rise above their socioeconomic status, (25) as a rejection of middle-class values. Most theories of juvenile delinquency have focused on children from disadvantaged families, (26) the fact that children from wealthy homes also commit crimes. The latter may commit crimes (27) lack of adequate parental control. All theories, however, are tentative and are (28) to criticism. Changes in the social structure may indirectly (29) juvenile crime rates. For example, changes in the economy that (30) to fewer job opportunities for youth and rising unemployment (31) make gainful employment increasingly difficult to obtain. The resulting discontent may in (32) lead more youths into criminal behavior. Families have also (33) changes these years. More families consist of one-parent households or two working parents; (34) , children are likely to have less supervision at home (35) was common in the traditional family structure.

单选题Any troop of wild animals should be approached warily.

单选题Knowing something as a whole is far from knowing all its______.

单选题Jacobson is often referred to ______ at the factory.

单选题You've been talking with David all evening when you ought to be ______ with other guests.

单选题The peach tree they planted when they got married began to______fruit last year.

单选题Wherever two or more unusual traits or situations are found in the same place, it is tempting to look for more than a coincidental relationship between them.

单选题______ this coming Thursday, it will be too late to enroll of the course. A. As of B. As for C. As to D. As on