单选题The food shows no sign of______.

单选题Turn on the television or open a magazine, and you {{U}}often see{{/U}} advertisements showing happy and balanced families.

单选题Proper lighting is a necessary for good eyesight even though human night vision can be temporarily impaired by extreme flashes of light. A. needful B. necessity C. exigency D. need

单选题While Uhaving orbited/U the sun, the satellite has sent more than four billion bits of information back to earth.

单选题Frostbitten fingers and toes should be treated with {{U}}lukewarm{{/U}} water.

单选题The professor recommended in his last lecture that English learners______on the lookout for tenses.

单选题Oranges are a ________source of vitamin C.

单选题The fact that most Americans live in urban areas does not mean that they reside in the center of large cities. In fact, more Americans live in the suburbs of large metropolitan areas than in the cities themselves. The Bureau of the Census regards any area with more than 2,500 people as an urban area, and does not consider boundaries of cities and suburbs. According to the Bureau, the political boundaries are less significant than the social and economic relationships and the transportation and communication systems that integrate a locale. The term used by the Bureau for an integrated metropolis is an MSA, which stands for Metropolitan Statistical Area. In general, an MSA is any area that contains a city and its surrounding suburbs and has a total population of 50,000 or more. At the present time, the Bureau reports more than 280 MSAs, which together account for 75 percent of the U.S. population. In addition, the Bureau recognizes 18 megapolises, that is, continuous adjacent metropolitan areas. One of the most obvious megapolises includes a chain of hundreds of cities and suburbs across 10 states on the East Coast from Massachusetts to Virginia, including Boston, New York, and Washington D. C. In the Eastern Corridor, as it is called, a population of 45 million inhabitants is concentrated. Another megapolis that is growing rapidly is the California coast from San Francisco through Los Angeles to San Diego.

单选题The maturity of IT industry and the integration of IT into the mainstream of economic activity and ______ constraints have forced the authority to rethink its role. A. budgetary B. documentary C. commentary D. portray

单选题Electronic mail has become an extremely important and popular means of communication. The convenience and efficiency of electronic mail are threatened by the extremely rapid growth in the volume of unsolicited commercial electronic mail. Unsolicited commercial electronic mail is currently estimated to account for over half of all electronic mail traffic, up from an estimated 7 percent in 2001, and the volume continues to rise. Most of these messages are fraudulent or deceptive in one or more respects. The receipt of unsolicited commercial electronic mail may result in costs to recipients who cannot refuse to accept such mail and who incur costs for the storage of such mail, or for the time spent accessing, reviewing, and discarding such mail, or for both. The receipt of a large number of unwanted messages also decreases the convenience of electronic mail and creates a risk that wanted electronic mail messages, both commercial and noncommercial, will be lost, overlooked, or discarded amidst the larger volume of unwanted messages, thus reducing the reliability and usefulness of electronic mail to the recipient. Some commercial electronic mail contains material that many recipients may consider vulgar or pornographic in nature. The growth in unsolicited commercial electronic mail imposes significant monetary costs on providers of Internet access services, businesses, and educational and nonprofit institutions that carry and receive such mail, as there is a finite volume of mail that such providers, businesses, and institutions can handle without further investment in infrastructure. Many senders of unsolicited commercial electronic mail purposefully disguise the source of such mail. Many senders of unsolicited commercial electronic mail purposefully include misleading information in the messages' subject lines in order to induce the recipients to view the messages. While some senders of commercial electronic mail messages provide simple and reliable ways for recipients to reject (or "opt-out" of) receipt of commercial electronic mail from such senders in the future, other senders provide no such "opt-out" mechanism, or refuse to honor the requests of recipients not to receive electronic mail from such senders in the future, or both. Many senders of bulk unsolicited commercial electronic mail use computer programs to gather large numbers of electronic mail addresses on an automated basis from Internet websites or online services where users must post their addresses in order to make full use of the website or service. The problems associated with the rapid growth and abuse of unsolicited commercial electronic mail cannot be solved by the government alone. The development and adoption of technological approaches and the pursuit of cooperative efforts with other countries will be necessary as well.

单选题Which of the following is NOT true about unwanted e-mail?

单选题Grocery prices were boosted again last month. A. attacked B. stabilized C. fixed D. raised

单选题______the English examination, I would have gone to the concert last Sunday. A．In spite of B．But for C．Because of D．As for

单选题I can't find you______You have no choice.

单选题Families like______Rockefellers have become______synonym for______wealth.

单选题The coach explained the regulations at length to make sure that none of his players world become violators.

单选题"An idea" as used in Line 5, refers to ______.

单选题In this passage, inertia means ______

单选题A source of stress NOT specifically mentioned in this passage is ______

单选题My husband is leaving for America