单选题It is difficult for us to explain phenomena that we have little or ______ direct knowledge.A. no anyB. noC. noneD. nothing

单选题______ is the address of a variable or a variable in which the address of another variable is stored. A．Director B．Pointer C．Array D．Record

单选题The following statements are in accordance with Halliday"s opinions on language EXCEPT______.

单选题Although they had agreed to defer the action the minister ordered to act immediately.

单选题It ______ quite a few years ______ the accused was declared innocent and set free. A. was; since B. is; that C. will be; when D. was; before

单选题In many cultures people who were thought to have the ability to ______ dreams were likely to be highly respected. A. interpret B. intervene C. inherit D. impact

单选题Bruce remained ______ for several hours after the ear accident.

单选题______doesn"t directly employ sexual impotence to symbolize spiritual poverty in his works.

单选题All the while he was terrified by the fear______he had cancer of the stomach.

单选题 Man cannot go on increasing his number at the present rate. In the{{U}} (56) {{/U}}30 years man will face a period of crisis.{{U}} (57) {{/U}}experts believe that there will be a widespread food{{U}} (58) {{/U}}. Other experts think this is{{U}} (59) {{/U}}pessimistic (悲观的), and that man can prevent things from{{U}} (60) {{/U}}. {{U}} (61) {{/U}}thing that man can do is to limit the{{U}} (62) {{/U}}of babies born. The need{{U}} (63) {{/U}}this is obvious, but it is not{{U}} (64) {{/U}}to achieve. People have to be{{U}} (65) {{/U}}to limit their families. In the countries of the population{{U}} (66) {{/U}}, many people like big families. The parents think that this{{U}} (67) {{/U}}a bigger income for the family and ensures there will be someone in the family who will look{{U}} (68) {{/U}}them in old age. Several governments have{{U}} (69) {{/U}}birth control policies in recent years.{{U}} (70) {{/U}}them are Japan, China, India and Egypt. In some{{U}} (71) {{/U}}the results have not been successful. Japan has been an{{U}} (72) {{/U}}. The Japanese adopted a birth control policy in 1948. People were{{U}} (73) {{/U}}to limit their families. The birth{{U}} (74) {{/U}}fell from 34.3 per thousand per year to about 17.0 per year{{U}} (75) {{/U}}present.

单选题People talked about a promising idea: using the electrical wiring already in the house to move data from room to room. One early application, the X10 system for controlling lights and appliances, didn"t always work welL The technology was certainly not ready to be used to bring web pages to computers anywhere in the house. Along came the wireless network. For $ 50, you could get the Ethernet sprayed across the house and never be confined by a cord to the wall. It was slow in those early days, very unreliable, and open to interruption if you couldn"t bother with setting up the encoded passwords. But it caught on. According to estimates made by Parks Associates, a market research firm based in Dallas, about 12.5 million homes now have wireless networks; another 10 million homes, mostly newer ones, have Ethernet. Cheap and prevalent is a hard combination to beat. However, technology companies continued to work on the idea. A version for power lines called Home Plug came out in 2002, and while it hardly affected sales of wireless network equipment, it sold enough that major companies like Intel, Cisco Sony, Sharp and Comcast created the Home Plug Alliance to push for next-generation products, with the first to come out later this year. Some companies are not waiting. Panasonic, Netgear, Maranta are already offering products that will move data through home electrical lines faster than routers using the current Wi-Fi standard for wireless networking. Panasonic started selling its HD-PLC Ethernet adapters for power lines last month. One adapter is attached to a router with a short Ethernet cable and plugged into a nearby wall socket. The second device is plugged into a socket elsewhere in the house. When a computer is linked to it with an Ethernet cable, data is transmitted through the home"s electrical wiring at speeds of up to 190 megabits a second. Netgear will be selling a similar system next month for about $ 300. It moves data at a slightly faster rate. Marantz says its ZR6001SP receiver will send music to special speakers in another room over power lines. The system includes both devices. The music listener controls the receiver and the CD players connected to it form a control pad on the speakers. These products seem hopeless candidates. Who would like to pay two or three times expensive than wireless network? The answer lies in simplicity. "It"s why most people need us," Robert said, noting the complexity of installing wireless network is evident by the fact that return rates on wireless networking devices drop to nearly zero. The three products" makers said that people who cannot get whole-house coverage with a wireless system or those plagued by dead zones might find it appealing.

单选题While watching television, ______. A. the telephone rang B. we heard the telephone ring C. and to play football D. the telephone was rung

单选题The research also raises the possibility that younger people A(treat) successfully for cancer B(with chemotherapy) may be C(subject to) premature aging later in life, a possibility that has D(never been) rigorously examined.

单选题Young people always complain, more or less justly, that their parents are out of ______ with modern ways.

单选题Computer monitoring is most often intended to improve efficiency and effectiveness in the workplace, but with good intentions comes the opportunity for abuse by employers and employees alike. Computer Monitoring in the 21st Century written by a futurist is an exceptional observation as to what the future may hold for those people choosing to enter the technological field such as industry, commerce, medicine and science. As computer monitoring increases, there comes a concern for the types of effects it may have in the workplace. The article says: "By the end of the decade, as many as 30 million people may constantly be monitored in their jobs." As computer systems become so sophisticated, this number will drastically increase. As we enter this new age of technology, we must remember that with more power comes more responsibility by employers and employees alike. Knowledge can be used as a weapon or as a tool. For instance, monitoring abuse can be found in the situation of airline agents. The agents discovered that by keeping customers on hold while finishing their work they could gain an extra 5-minute break. In the future, employees who are accustomed to evading the monitoring system may no longer be able to tolerate it. These types of employees may find they can no longer survive the added pressure of not being able to evade the system. While monitoring can add pressure to some employees, it can also be a relief to others. It is a relief to the employee, because it provides information readily at hand. With the use of prompts, acting as reminders to workers, the information needed is passed on efficiently allowing employees to do a better job. However, if prompts are used to tell an employee how much time has been wasted or how bad an employee is doing his job, it could cause the opposite effect. Monitoring can have a positive effect on workers by letting the employees access their own information. In a study, early information about job performance given by a computer is accepted better than a performance rating given by a boss. At this time, monitoring is based on the output of an employee's performance. In the future, there will be more freedom for employees to use their own ideas, therefore making monitoring more effective. One example of monitoring as a weapon is seen when a woman who took an extra minute in the bathroom was threatened with loosing her job. With this added stress she suffered a nervous breakdown. The company insisted that they were not "spying" but were only trying to improve their business. If monitoring is not used correctly, businesses will suffer with increases in operating costs because of increased turnover, absenteeism, medical costs and worker's compensation. Employers who use positive reinforcement with monitoring will guarantee better motivation. Legislation has the potential to help employees with issues of better treatment and the fight to privacy. In the new century, companies that succeeded will be the ones who learn from the past and from the "me boss and you employee" mentality. A good blacksmith can take a hammer and forge a weapon into a tool that can benefit the whole village. Employers are the blacksmiths; employees are the hammers. Monitoring is the tool. It takes both to make a tool to benefit the future.

单选题2 To get from Kathmandu to the tiny village in Nepal, Dave Irvine-Halliday spent more than two days. When he arrived, he found villagers working and reading around battery powered lamps equipped with light-emitting diodes, or LEDs—the same lamps he had left there in 2000. Irvine-Halliday, an American photonics engineer, was not surprised. He chose to use LED bulbs because they are rugged, portable, long-lived, and extremely efficient. Each of his lamps produces a useful amount of illumination from just one watt of pow- er. Villagers use them about four hours each night, then top off the battery by pedaling a generator for half an hour. The cool, steady beam is a huge improvement over lamps still common in developing countries. In fact, LEDs have big advantages over familiar incandes cent (白炽的) lights as well--so much so that Irvine-Halliday expects LEDs will eventual ly take over from Thomas Edison's old lightbulb as the world's main source of artificial il lumination. The dawn of LEDs began about 40 years ago, but early LEDs produced red or green glows suitable mainly for displays in digital clocks and calculators. A decade ago, engineers invented a semiconductor crystal made of an aluminum compound that produced a much brighter red light. Around the same time, a Japanese engineer developed the first practical blue LED. This small advance had a huge impact because blue, green, and red LEDs can be combined to create most of the colors of the rainbow, just as that in a color television picture. These days, high-intensity color LEDs are showing up everywhere such as the traffic lights. The reasons for the rapid switchover are simple. Incandescent bulbs have to be re placed annually, but LED traffic lights should last five to yen years. LEDs also use 80 to 90 percent less electricity than the conventional signals they replace. Collectively, the new traffic lights save at least 400 million kilowatt-hours a year in the United States. Much bigger savings await if LEDs can supplant Mr. Edison's bulb at the office and in the living room. Creating a white-light LED that is energy-saving, cheap and appealing has proved a tough engineering challenge. But all the major lightbulb makers—including Gener al Electric, Philips, and Osram-Sylvania—are teaming up with semiconductor manufactur ers to make it happen.

单选题The father gave his son a horse, which was considered extravagant by the rest of the family.

单选题The evolutionary process culminating in man was finally completed about 35,000 years ago with the appearance of Homo Sapiens, or "thinking man." (1) in broadest perspective, this represents the second major turning (2) in the course of (3) on this planet. The first occurred when life (4) out of inorganic matter. After that momentous (5) , all living forms evolved by adapting (6) their environment, as was evident during the climate turmoil of the Pleistocene. But with the (7) of man, the evolutionary process was (8) . No longer did genes adapt to environment. Instead, man adapted by changing the environment to (9) his genes. Today, a third (10) turning point appears (11) , as man's growing knowledge of the structure and function of genes may soon enable him to (12) his genes as well as his environment. Man, and only man, has been able to create a made-to-order environment, or culture, as it is called. The reason is (13) only man can symbolize, or (14) things and concepts divorced from here-and-now reality. Only he laughs, and only he knows that he will die. Only he has wondered (15) the universe and its origins, about his place in it and in the hereafter. With these unique and revolutionizing abilities, man has been able to (16) with his environment without alteration. His culture in the new no biological way of having fur in the Arctic, water storage in the desert, and fins in the water. More concretely, culture (17) tools, clothing, ornaments, institutions, language, art forms, and religious beliefs and (18) . All these have served to adapt man to his physical environment and to his fellowman. Indeed, story of man is simply the story of a (19) of cultures that he has created, form his Paleolithic (20) to the present day.