单选题{{B}}Text 3{{/B}} Children in the United States are exposed to many influences other than that of their families. Television is the most significant of these influences, because the habit of watching television usually begins before children start attending school. And, by the time that the average child finishes high school, he or she will have spent 18,000 hours in front of a television set as opposed to 12,000 hours in a classroom. Parents are concerned about these figures. They are also concerned about the lack of quality in television programs for children. The degree of violence in many of these shows also worries them. Even if it is unreal--a cartoon cat beating up a cartoon mouse with a baseball bat--this violence may have a negative effect on the young minds exposed to it. Studies indicate that, when children are exposed to violence, they may become aggressive or insecure. Parents are also concerned about the commercials that their children see on television. Many parents would like to see fewer commercials during programs for children. And some parents feel that these shows should not have any commercials at all because young minds are not mature enough to deal with the claims made by advertisers. Educational television has no commercials and has programs for children that many parents approve of. The most famous of these is "Sesame Street", which tries to give preschool children a head start in learning the alphabet and numbers. It also tries to teach children useful things about the world in which they live. Even though most parents and educators give "Sesame Street" and shows like it high marks for quality, some critics argue that all television, whether educational or not, is harmful to children. These critics feel that the habit of watching hours of television every day turns children into bored and passive consumers of their world rather than encouraging them to become active explorers of it. We still do not know enough about the effects of watching television to be able to say whether or not it is good for children. Until we do, perhaps it would be wise to put a warning on television sets such as the one on cigarette packages: "Caution: Watching Too Much Television May Be Harmful to Your Child's Developing Mind."

单选题It is easy for many kinds of insects to live in the desert because ______.

单选题Who can make big money in the new century according to the passage?

单选题Food deteriorates during storage because ______.

单选题The author is likely to go on to _______.

单选题According to the stranger, in the West the winters are _________.

单选题Art is considered by many people to be little more than a decorative means of giving pleasure. This is not always the case, however, at times, art may be seen to have a purely functional side as well. Such could be said of the sand paintings of the Navaho Indians of the American Southwest; these have a medicinal as well as an artistic purpose. According to Navaho traditions, one who suffers from either a mental or physical illness has in some way disturbed or come in contact with the supernatural--perhaps a certain animal, a ghost or the dead. To counteract this evil contact, one of his relatives will employ a medicine man called a "singer" to perform a healing ceremony which will attract a powerful supernatural being. During the ceremony, which may last from 2 to 9 days, the "singer" will produce a sand-painting on the floor of the Navaho Hogan. On the last day of the ceremony, the patient will sit on this sand-painting and the "singer" will rub the ailing parts of the patient's body with sand from a specific figure in the sand-painting. In this way the patent absorbs the power of that particular supernatural being and becomes strong like it. After the ceremony, the sand-painting is then destroyed and disposed of, so its power will not harm anyone. The art of sand-painting is handed dawn from old "singers" to their students. The materials used are easily found in the areas the Navaho inhabit; brown, red, yellow and white sandstone, which is pulverized by being crushed between 2 stones much as com is ground into flour. The "singer" holds a small amount of this sand in his hand and lets it flow between his thumb and forefingers onto a clean, flat surface on the floor. With a steady hand end great patience, he is thus able to create designs of stylized people, snakes and other creatures that have power in the Navaho belief system, the traditional Navaho does not allow reproduction of sand-paintings, since he believes the supernatural powers that taught him the craft have forbidden this; however, such reproductions can in fact be purchased today in tourist shops in Arizona and New Mexico. These are done by either Navaho Indians or by other people who wish to preserve this craft.

单选题Whatdidthemanagreewith?

单选题Which of the following is a reason for people' s growing interest in natural foods?

单选题Questions 19～22 are based on the following dialogue about travelling.

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单选题[此试题无题干]

单选题"Is jazz a kind of folk music? Is it a performing style? How is it different from other kinds of music?" There is no simple answer to these questions, because the most important quality of jazz comes from its unique combination of different musical sources over a period of almost 400 years. The quality that unites the many different jazz forms is, in some degree, separate from its musical sources. That quality is the expression of freedom. The idea of freedom is central. The ancestors of jazz were black people from West Africa who were brought to America as slaves, or forced laborers, from the early 1600s to the mid-1800s. Most of them remained slaves until President Lincoln set them free on January 1, 1863, at the midpoint of the American Civil War. With the less of their personal freedom and the breaking up of their families, the slaves also borrowed the social traditions of their music from Africa. The complex rhythms of this music involved a number of people performing together. The breaking apart of these social groups forced slaves to create new songs--that is, to develop a completely new musical tradition. Using some of the remembered African rhythms, the slaves gradually began to add some features of the European classical music that was played by the white slave owners. The slaves were also influenced by American folk songs. But the result of adding these borrowed elements to the complex African rhythms was the beginning of a completely new kind of music. Still, this music only existed privately among groups of slaves. The slaves' work had another effect on their music. It introduced new kinds of music rhythms. Some of these rhythms became work songs to accompany their planting end picking of cotton. Other rhythms were developed by teams of workers who needed to lift heavy loads of cotton onto carts that passed through the fields. Later, during the building of the railroads, individual workers created new songs to match the sharp rhythms of steel striking, as they fixed the rails into place.

单选题What docs the man imply about Mary?