单选题被誉为启蒙主义最杰出的现实主义戏剧家是( )。

单选题The tomato juice left brown______on the front of my jacket. A. spot B. point C. track D. trace

单选题Changes in climate ______ slowly through the years.

单选题Community cancer clusters are viewed quite differently by citizen activists than by epidemiologists. Environmentalists and concerned local residents, for instance, might immediately suspect environmental radiation as the culprit when a high incidence of cancer cases occurs near a nuclear facility. Epidemiologists, in contrast, would be more likely to say that the incidences were "inconclusive" or the result of pure chance. And when a breast cancer survivor, Lorraine Pace, mapped 20 breast cancer cases occurring in her West Islip, Long Island, community, her rudimentary research efforts were guided more by hope that a specific environmental agent could be correlated with the cancers than by scientific method. When epidemiologists study clusters of cancer cases and other noncontagious conditions such as birth defects or miscarriage, they take several variables into account, such as background rate (the number of people affected in the general population), cluster size, and specificity (any notable characteristics of the individual affected in each case). If a cluster is both large and specific, it is easier for epidemiologists to assign blame. Not only must each variable be considered on its own, but it must also be combined with others. Lung cancer is very common in the general population. Yet when a huge number of cases turned up among World War II shipbuilders who had all worked with asbestos, the size of the cluster and the fact that the men had had similar occupational asbestos exposures enabled epidemiologists to assign blame to the fibrous mineral. Although several known carcinogens have been discovered through these kinds of occupational or medical clusters, only one community cancer cluster has ever been traced to an environmental cause. Health officials often discount a community's suspicion of a common environmental cause because citizens tend to include cases that were diagnosed before the afflicted individuals moved into the neighborhood. Add to this the problem of cancer's latency. Unlike an infectious disease such as cholera, which is caused by a recent exposure to food or water contaminated with the cholera bacterium, cancer may have its roots in an exposure that occurred 10 to 20 years earlier. Do all these caveats mean that the hard work of Lorraine Pace and other community activists is for nothing? Not necessarily. Together with many other reports of breast cancer clusters on Long Island, the West Islip situation highlighted by Pace has helped epidemiologists lay the groundwork for a well designed scientific study.

单选题Joanne: Hey, you look concerned. ______ Harry: The final exam. I"m not fully prepared yet.

单选题 The Main Library has five floors open to the public. FOURTH FLOOR: Social Sciences & History. 300--399, 650--659, 900--999. Law books are shelved in a separate area--follow signs for the Law Library. THIRD FLOOR: Humanities. 100--199, 200---299, 400--499, 700--709 & 800--899. SECOND FLOOR: Science and Technology. 500--599, 600--649 & 660--699. FIRST FLOOR: Current (unbound) Periodicals. An information point is inside the Periodicals Office. GROUND FLOOR: Reference. General reference books and bibliographies. The Reference Librarians on each floor are available to answer queries during office hours. At other times you can ask at the Issue Desk, on the Ground Floor. Books are shelved according to size= normal size and large size. The shelves are color coded to help you identify them: RED Large books WHITE Normal size books YELLOW Large periodicals BLUE Normal size periodicals Books returned the previous day may be on the Recent Returns shelves, next to the Reference Librarians' desks.

单选题What does the word "novel" probably mean in Par

单选题A national debate is now ______ about whether we should replace golden weeks with paid vacations. A. in the way B. by the way C. under way D. out of the way

单选题If you want to borrow books about American history, which floor would you go to? ______.

单选题He is quite sure that it's ______ impossible for him to fulfill the task within two days. A. roughly B. exclusively C. fully D. absolutely

单选题Human beings are animals. We breathe, eat and digest, and reproduce the same life (3) common to all animals. In a biological laboratory, rats, monkeys and humans seem very much the same. However, biological understanding is not enough: (2) itself, it can never tell us what human beings are. (3) to our physical equipment the naked human body—we are not an (4) animal. We are tropical creatures, (5) hairless and sensitive to cold. We are not fast and have neither claws nor sharp teeth to defend ourselves. We need a lot of food but have almost no physical equipment to help us get it. In the purely physical (6) , our species seems a poor (7) for survival. But we have survived—survived and multiplied and (8) the earth. Some day we will have a (9) living on the moon, a place with neither air nor water and with temperatures that turn gases into solids. How can we have done all these things? Part of the answer is physical. (10) its limitations, our physical equipment has some important potentials.

单选题Peter: What's there to do at night? Clerk: There are clubs, concerts, players and so on.______! A. You make it R You find it C. You manage it D. You name it

单选题The teacher warned that whoever was caught ______ during the test would be punished. A. cheat B. cheating C. to cheat D. to be cheating

单选题Without his glasses, he's ______ to smash into a tree.

单选题John seems a nice person.______, I don't trust him.

单选题Wife: Did you eat all the muffins? Husband: ______.

单选题It's difficult to believe that this little brown thing will eventually turn ______ a beautiful butterfly.

单选题Maggie ran back to the kitchen, eggs ______ carefully in her hands.

单选题The patient's health failed to such an extent that he was put into ______ care. A. tense B. rigid C. intensive D. tight