单选题They are going to have the serviceman ______ an electric fan in the office tomorrow. A. install B. to install C. to be installed D. installed

单选题We were lost at sea, at the ______ of wind and weather.

单选题A: Peter, why don't you come to Jessica's birthday party with us? B: ______ A. How dare you invite me? I won't go. B. That's very kind of you. I'd love to. C. Yeah, thanks anyway. D. Whether I'll go or not is not your business, OK?

单选题Text 4 Non-indigenous (non-native) species of plants and animals arrive by way of two general types of pathways. First, species having origins outside the United States may enter the country and become established either as free-living populations or under human cultivation--for example, in agriculture, horticulture, aquaculture, or as pets. Some cultivated species subsequently escape or are released and also become established as free-living populations. Second, species of either U.S. or foreign origin and already within the United States may spread to new locales. Pathways of both types include intentional as well as unintentional species transfers. Rates of species movement driven by human transformations of natural environments as well as by human mobility--through commerce, tourism, and travel--greatly exceed natural rates by comparison. While geographic distributions of species naturally expand or contract over historical time intervals (tens to hundreds of years), species' ranges rarely expand thousands of miles or across physical barriers such as oceans or mountains. Habitat modification can create conditions favorable to the establishment of non-indigenous species. Soil disturbed in construction and agriculture is open for colonization by non-indigenous weeds, which in turn may provide habitats for the non-indigenous insects that evolved with them. Human-generated changes in fire frequency, grazing intensity, as well as soil stability and nutrient levels similarly facilitate the spread and establishment of non-indigenous plants. When human changes to natural environments span large geographical areas, they effectively create passages for species movement between previously isolated locales. The rapid spread of the Russian wheat aphid to fifteen states in just two years following its 1986 arrival has been attributed in part to the prevalence of alternative host plants that are available when wheat is not. Many of these are non-indigenous grasses recommended for planting on the forty million or more acres enrolled in the U.S. Department of Agriculture Conservation Reserve Program. A number of factors perplex quantitative evaluation of the relative importance of various entry pathways. Time lags often occur between establishment of non-indigenous species and their detection, and tracing the pathway for a long-established species is difficult. Experts estimate that non-indigenous weeds are usually detected only after having been in the country for thirty years or having spread to at least ten thousand acres. In addition, federal port inspection, although a major source of information on non-indigenous species pathways, especially for agriculture pests, provides data only when such species enter via closely-examined routes. Finally, some comparisons between pathways defy quantitative analysis--for example, which is more "important": the entry path of one very harmful species or one by which many but less harmful species enter the country?

单选题Jazz is a kind of music that has often been called the only art form to originate in the United States. The history of 31 began in the late 1800s. The music grew from a 32 of influences, including black American music, African rhythms, American band traditions and instruments, and European harmonies and forms. Much of the best jazz is still written and 33 in the United States. But musicians from many other countries are 34 major contributions to jazz. Jazz was actually 35 appreciated as an important art form in Europe 36 it gained such recognition in the United States. The earliest jazz was performed by black Americans who had little or no training in Western music. These musicians drew on a strong musical culture from 37 life. As jazz grew 38 popularity, its sound was influenced by 39 with formal training and classical backgrounds. During its history, jazz has absorbed influences from the folk and classical music of Africa, and other parts of the world. The development of instruments with new and 40 characteristics has also influenced the Sound of jazz.

单选题The computer has changed the way we work, team, communicate, and play; Virtually ewery kind of organization throughout the world conducts business with computers. Students, teachers, and research scientists use the computer as a learning tool. Millions of individuals and organizations communicate with one another over a network of computers called the Internet. Computer games entertain people of all ages. Almost all computers are electronic digital computers. They are electronic in their use of electric current(电流) to carry information. They are digital in. that they process information as units of electric charge representing numbers. The word digital means having to do with numbers. To enable a computer to process information that is not numerical — such as words, pictures, or sounds — the computer or some other &vice must first digitize: that information. A device digitizes information by translating it into charges that represent numbers. After the computer processes the digitized information by working with the charges, the computer or a device: connected to the computer translates its results hack into their original form. Thus, an artist might use a machine called a scanner to digitize a photograph. The artist would next process the resulting electric charges in a computer to Change the photograph perhaps to add a border. The artist would then use a printer connected to the computer to produce a, copy of the altered photo. Digital computers are one of two general kinds of computers. The other kind is calculating devices called analog computers. An analog computer represents amounts with physical quantities, such as distances along a scale, rather than with numbers.

单选题{{B}}16-20{{/B}} After a 300 million yuan renovation project, Lidai Diwang Miao, or the Imperial Temple of Emperors of Successive Dynasties, was reopened to the public last weekend. Originally constructed about 470 years ago, during the reign of Emperor Jiajing of the Ming Dynasty, the temple was used by emperors of both the Ming and Qing to offer sacrifices to their ancestors. It underwent two periods of renovation in the Qing Dynasty, during the reigns of emperors Yongzheng and Qianlong. From 1929 until early 2000, it was part of Beijing No.159 Middle School. The temple's Jingdechongsheng Hall contains stone tablets memorializing 188 Chinese emperors. The Jinzhuan bricks used to pave the floor, the same as those used in the Forbidden City, are finely textured and golden-yellow in color. According to Xi Wei, an official from the Xicheng District government present at the reopening of the temple, Jinzhuan bricks were made in Yuyao, Suzhou, specially for imperial use. The renovation was done strictly according to that carried out at the orders of Emperor Qianlong, and only those sections of the temple too damaged to repair have been replaced.

单选题Bob: Why didn"t you come to my party last night? Bill: I"m sorry, ______. I had to visit my grandmother at the hospital.

单选题It is a (an) ______ truth that man is the only animal that has the power to speak and reason.

单选题Speaker A: Is there anything I can do for you? Speaker B: ______, there is something.

单选题A : Can I help with the luggage? It looks a bit heavy. B: ______ A. Yes, they are full of books. B. Don' t bother. I can take care of it myself. C. Never mind. You don' t have to be so polite. D. OK. Go ahead and do it.

单选题Beth: You look a little pale. Are you OK? Jerry:______ I feel terrible.

单选题Tom was glad that his success would ______ for those who would follow. A. be easier B. be easier to make C. make it easier D. make things easier

单选题______,they have boldly undertaken the construction of a 26 storied building.

单选题This is the best one of automobiles that ______ in working order. A. is B. are C. had been D. have

单选题There is Uabundant/U evidence that cars have a harmful effect on the environment.

单选题Jessica Bucknam shouts "tiao!" (tee-ow) and her fourth-grade students jump. "Dun!" (doo-wen) she commands, and they crouch(蹲). They giggle(咯咯地笑) as the commands keep coming in Mandarin Chinese. Half of the 340 students at the K-5 school are enrolled in the program. They can continue studying Chinese in middle and high schools. The goal: to speak like natives. About 24,000 American students are currently learning Chinese. Most are in high schools. But the number of younger students is growing in response to China"s emergence as a global superpower. "China has become a strong partner of the United States," says Mary Patterson, Woodstock"s principal. "Children who learn Chinese at a young age will have more opportunities for jobs in the future." Isabel Weiss, 9, isn"t thinking about the future. She thinks learning Chinese is fun. "When you hear people speaking in Chinese, you know what they"re saying," she says. "And they don"t know that you know."

单选题Mark often attempts to escape ______ whenever he breaks traffic regulations. A. having been fined B. being fined C. to have been fined D. to be fined

单选题Many people start relationships because of loneliness. Loneliness and being alone are not synonymous. Loneliness is a state of painful isolation, of feeling cut off from friends and family. Being alone, a state of solitude (独处), can be quite desirable most of the time, since it allows us to work, study, live, or reflect on the world around us. Solitude is usually a matter of choice; loneliness is not. Lonely people tend to spend a lot of time by themselves, eat dinner alone, spend weekends alone, and participate in few if any social activities. They are unlikely to date. Some lonely people report having many friends, but a closer look suggests that these "friendships" are shallow. Lonely people are unlikely to share confidences. Loneliness tends to peak during adolescence (青春期). This is when most young people begin to replace family ties with peer relationships. Loneliness is quite often connected with feelings of depression and with a feeling of being "sick at heart." Loneliness is even reported among some married people. In one of the recent studies, lonely wives tended to feel less liking and love for their partners and expressed less satisfaction with their married life. Lonely husbands reported less liking for their wives and less intimacy in their relationships.

单选题The patient's health failed to such an extent that he was put into ______ care.