单选题Female sea turtles, before laying (her) eggs, swim (as much) as 2,000 kilometers (to return) to the beaches (where)they themselves were hatched.A. herB. as muchC. to returnD. where

单选题Don"t count on others to look up to you if you look down on yourself.

单选题Such experience helps promote one"s alertness to other cultures, as well as a better appreciation of one"s own culture.

单选题Lead deposits, which accumulated in soil and snow during the 1960's and 1970's, were primarily the result of leaded gasoline emissions originating in the United States. In the twenty years that the Clean Air Act has mandated unleaded gas use in the United States, the lead accumulation world-wide has decreased significantly. A study published recently in the journal Nature shows that air-borne leaded gas emissions from the United States were the leading contributor to the high concentration of lead in the snow in Greenland. The new study is a result of the continued research led by Dr. Charles Boutron, an expert on the impact of heavy metals on the environment at the National Center for Scientific Research in France. A study by Dr. Boutron published in 1991 showed that lead levels in arctic (北极的) snow were declining. In his new study, Dr. Boutron found the ratios of the different forms of lead in the leaded gasoline used in the United States were different from the ratios of European, Asian and Canadian gasolines and thus enabled scientists to differentiate (区分) the lead sources. The dominant lead ratio found in Greenland snow matched that found in gasoline from the United States. In a study published in the journal Ambio, scientists found that lead levels in soil in the North-eastern United States had decreased markedly since the introduction of unleaded gasoline. Many scientists had believed that the lead would stay in soil and snow for a longer period. The authors of the Ambio study examined samples of the upper layers of soil taken from the same sites of 30 forest floors in New England, New York and Pennsylvania in 1980 and in 1990. The forest environment processed and redistributed the lead faster than the scientists had expected. Scientists say both studies demonstrate that certain parts of the ecosystem (生态系统)respond rapidly to reductions in atmospheric pollution, but that these findings should not be used as a license to pollute.

单选题The {{U}}nasty{{/U}} language of local officials makes them seem very ignorant and rude.

单选题Robert J. Oppenheimer was a famous American physicist, who directed the (1) of the first atomic bombs. Oppenheimer was born in New York City on April 22, 1904, and was educated at Harvard University and the universities of Cambridge. After (2) the International Education Board from 1928 to 1929, he became a professor of physics at the University of California and the California Institute of Technology, where he built up large (3) of theoretical physics. He was noted for his contributions (4) to the theory of relativity, cosmic rays, and neutron stars. From 1943 to 1945 , Oppenheimer served as director of the atomic bomb project at Los Alamos, New Mexico. His leadership and organizational skills (5) him the Presidential Medal of Merit in 1946. In 1947 he became director of the Institute for Advanced Studies in Princeton, New Jersey, serving there (6) the year before his death. He was also chairman of the General Advisory Committee of the Atomic Energy Commission from 1947 to 1952 and served (7) as an adviser. In 1954, however, he was suspended from this position (8) his past association with Communists. This action (9) the political atmosphere of the time, as well as the dislike of some politicians and military (10) for Oppenheimer's opposition to development of the hydrogen bomb and his (11) of arms control. His (12) was not really in doubt. (13) , efforts were made to clear his name, and in 1963 the AEC (14) him its highest honor, the Enrico Fermi Award. Oppenheimer (15) his final years to study of the relationship between science and society. He died in Princeton on February 18, 1967.

单选题Which country were the first to add sugar to their cocoa drink?

单选题{{B}}Passage One{{/B}} Andrea had never seen an old lady hitchhiking (搭车) before. However, the weather and the coming darkness made her feel sorry for the lady. The old lady had some difficulty climbing in through the ear door, and pushed her big brown canvas shopping bag down onto the floor under her feet. She said to Andrea, in a voice that was almost a whisper, "Thank you dearie --I'm just going to Brkcdburne." Something in the way the lady spoke, and the way she never turned her head, made Andrea uneasy about this strange hitchhiker. She didn't know why, but she felt instinctively that there was something wrong, something odd, and something dangerous. But how could an old lady be dangerous? It was absurd. Careful not to turn her head, Andrea looked sideways at her passenger. She studied the hat, the dirty collar of the dress, the shapeless body, the arms with their thick black hairs... Thick black hairs? Hairy arms? Andrea's blood froze. This wasn't a woman. It was a man. At first, she didn't know what to do. Then suddenly, an idea came into her racing, terrified brain. Swinging the wheel suddenly, she threw the car into a skid (刹车), and brought it to a halt. "My God!" she shouted. "A child! Did you see the child? I think I hit her!" The "old lady" was clearly shaken by the sudden skid, "I didn't see anything dearie," she said. "I don't think you hit anything." "I'm sure it was a child!" insisted Andrea. "Could you just get out and have a look? Just see if there's anything on the road?" She held her breath. Would her plan work? It did. The passenger slowly climbed out to investigate. As soon as she was out of the vehicle, Andrea gunned the engine and accelerated madly away, and soon she had put a good three miles between herself and the awful hitchhiker. It was only then that she thought about the bag lying on the floor in front of her. Maybe the bag would provide some information about the real identity about the man. Pulling into the side of the road, Andrea opened the heavy bag curiously. It contained only one item--a small hand axe, with a razor-sharp blade. The axe and the inside of the bag were covered with the dark red stains of dried blood. Andrea began to scream.

单选题Her panic was transient, and ceased when she began to speak.

单选题It is generally believed that no prisoner would readily Ugive/U a fellow prisoner Uaway/U.

单选题Susan loves chocolate so much that she can hardly resist its______.

单选题We have to install new water pipes in our house; these are {{U}}corroded{{/U}}.

单选题Important newspapers are supposed to carry Uauthentic/U news reports and try to be informative.

单选题I didn't listen to Mom and I was not surprised at the look of______on her face.

单选题A：Nancy，you look very well． B：Thank you，Jane．You look wonderful．Your weekend swimming must have done good to you． A：______

单选题In the phenomenon of atomic fission, the nucleus is split into two pieces of approximately equal mass.

单选题It may look like just another playgroup, but a unique educational center in Manhattan is really giving babies something to talk about. "It's a school to teach languages to babies and young children with games, songs--some of the classes also have arts and crafts," said Francois Thibaut, the founder of the Language Workshop for Children, a place where babies become bilingual. Children as young as few months are exposed to French and Spanish before many of them can even speak English. Educators use special songs and visual (视觉的) aids to ensure that when a child is ready to talk, the languages will not be so foreign. "Children have a unique capacity to learn many languages at the same time," said Thibaut. "Already at nine months, a child can tell the differences between the sounds he or she has heard since birth and the sounds he or she has never heard yet." Thibaut says the best time to expose children to language is from birth to 3 years old. For the last 30 years, the school has been using what it caus the Thibarut Technique, a system that combines language lessons with child's play. "I always wanted to learn Spanish, but by the time I got to high school it was too late to pick it up and speak fluently," said Marc Lazare, who enrolled his son at the school. "I figured at this age, two, it's a perfect time for him to learn." Aside from learning a language, the kids also gain a tremendous sense of confidence. One young student boasted that aside from French, she can speak five languages (though that included "monkey" and "lion"). The school gives children the tools to communicate, and sometimes that gives them an advantage over their parents. "I think they sometimes speak French when they think ! won't understand them," said parent Foster Gibbons. Depending on the age group, classes run from 45 minute up to 2 hours. Even when students are not in class, the program is designed to make sure the learning continues at home. Tapes and books are included so kids can practice on their own.