单选题Computer Virus The computer virus is an outcome of the computer overgrowth in the 1980s. The cause of the term "computer virus" is the likeness between the biological virus and the evil program infected with computers. The origin of this term came from an American science fiction "The Adolescence of P—1" written by Thomas J·Ryan, published in 1977. Human viruses invade a living cell and turn it into a factory for manufacturing viruses. However, computer viruses are small programs. They replicate by attaching a copy of themselves to another program. Once attached to host Program, the viruses then look for other programs to "infect". In this way, the virus can spread quickly throughout a hard disk or an entire organization when it infects a LAN or a multi—user system. At some point, determined by how the virus was programmed the virus attacks. The timing of the attack can be linked to a number of situations, including a certain time or date, the presence of a particular file, the security privilege level of the user, and the number of times a file is used. Likewise, the mode of attack varies. So—called "benign" viruses might simply display a message, like the one that infected IBM"s main computer system last Christmas with a season"s greeting. Malignant viruses are designed to damage the system. The attack is to wipe out data, to delete flies or to format the hard disk. What Kind of Viruses Are There? There are four main types of viruses: shell, intrusive, operating system and source ode. Shell viruses wrap themselves around a host program and don"t modify the original program. Shell programs are easy to write, which is why about half of viruses are of this type. Intrusive viruses Invade an existing program and actually insert a portion of themselves into the host program. Intrusive viruses are hard to write and very difficult to remove without damaging the host file.

单选题The dancers moved across the dimly lit stage.A. inadequatelyB. hardlyC. faintlyD. sufficiently

单选题She is always diplomatic when she deals with naughty students.______

单选题Choreographer Twyla Tharp uses familiar dance movements in original ways to create works filled with clever gestures and abrupt changes in motion and mood. A．graceful B．creative C．sudden D．dramatic

单选题The odd thing was that he didn"t recognize me.

单选题Afterwards there was just a feeling of let-down .

单选题The herb medicine Ueventually/U cured her disease.

单选题 Man of Few Words Everyone chases success, but not all of us want to be famous. South African writer John Maxwell Coetzee is {{U}} {{U}} 1 {{/U}} {{/U}}for keeping himself to himself. When the 63-year-old was named the 2003 Nobel Prize winner for literature earlier this month, reporters were warned that they would find him "particularly difficult to {{U}} {{U}} 2 {{/U}} {{/U}}". Coetzee lives in Australia but spends part of the year teaching at the University of Chicago. He seemed {{U}} {{U}} 3 {{/U}} {{/U}}by the news he won the $1.3 million prize. "It came as a complete surprise. I wasn't even aware they were due to make the announcement," he said. His {{U}} {{U}} 4 {{/U}} {{/U}}of privacy led to doubts as to whether Coetzee will attend the prize-giving in Stockholm, Sweden, on December 10. But despite being described as {{U}} {{U}} 5 {{/U}} {{/U}}to track down, we critics agree that his writing is easy to get to know. Born in Cape Town, South Africa, to all English-speaking family, Coetzee {{U}} {{U}} 6 {{/U}} {{/U}}his breakthrough in 1980 with the novel Waiting for the Barbarians. He {{U}} {{U}} 7 {{/U}} {{/U}}his place among the world's leading writers with two Booker prize victories, Britain's highest honour for novels. He first {{U}} {{U}} 8 {{/U}} {{/U}}in 1983 for the Life and Times of Michael K and his second title came in 1999 for Disgrace. A major theme in his work is South Africa's former apartheid system, which divided whites from blacks. {{U}} {{U}} 9 {{/U}} {{/U}}with the problems of violence, crime and racial division that still exist in the country, his books have enabled ordinary people to understand apartheid {{U}} {{U}} 10 {{/U}} {{/U}}within. "I have always been more interested in the past than the future," he said in a rare interview. "The past {{U}} {{U}} 11 {{/U}} {{/U}}its shadow over the present. I hope I have made one or two people think {{U}} {{U}} 12 {{/U}} {{/U}}about whether they want to forget the past completely." In fact this purity in his writing seems to be {{U}} {{U}} 13 {{/U}} {{/U}}in his personal life. Coetzee is a vegetarian, a cyclist rather than a motorist and doesn't drink alcohol. But what he has {{U}} {{U}} 14 {{/U}} {{/U}}to literature, culture and the people of South Africa is far greater than the things he has given up. "In looking at weakness and failure in life," the Nobel prize judging panel said, "Coetzee's work {{U}} {{U}} 15 {{/U}} {{/U}}the divine spark in man."

单选题Without the friction between their feet and the ground, people would never be able to walk.

单选题No part of New Hampshire is far from water.

单选题Successful leaders dominate events rather than react to them.

单选题Many of Edith Wharton"s best stories were completed under great personal strain.

单选题The average modified mouse lived

单选题Charter Schools American public education has changed in recent years. One change is that increasing numbers of American parents and teachers are starting independent public schools (1) charter schools (特许学校). In 1991, there were no charter schools in the United States. Today, more than 2,300 charter schools (2) in 34 states and the District of Columbia. 575,000 students (3) these schools. The students are from 5 years of age through 18 or older. A charter school is (4) by groups of parents, teachers and community (社区) members. It is similar in some ways (5) a traditional public school. It receives tax money to operate just as other public schools do. The (6) it receives depends on the number of students. The charter school must prove to local or state governments that its students are learning. These governments (7) the school with the agreement, or charter that permits it to operate. Unlike a traditional public school, (8) , the charter school does not have to obey most laws governing public schools. Local, state or federal governments cannot tell it what to (9) . Each school can choose its own goals and decide the ways it wants to (10) those goals. Class sizes usually are smaller than in many traditional public schools. Many students and parents say (11) in charter schools can be more creative. However, state education agencies, local education-governing committees and unions often (12) charter schools. They say these schools may receive money badly (13) by traditional public schools. Experts say some charter schools are doing well while others are struggling. Congress provided 200 million dollars for (14) charter schools in the 2002 federal budget (预算). But, often the schools say they lack enough money for their (15) . Many also lack needed space.

单选题The city was literally destroyed.A. obviouslyB. eventuallyC. actuallyD. likely

单选题A long journey in cold weather is {{U}}dreadfully{{/U}} tiring.

单选题The Klondike was the {{U}}scene{{/U}} of one of the biggest gold rushes the world has ever known.

单选题She is slender , with delicate wrists and ankles.

单选题which of the following is NOT true?

单选题This kind of animals are on the verge of extinction , because so many are being killed for their fur.