单项选择题

Scientific tradition demands that scientific papers follow the formal progression :method first, results second, conclusion third. The rules permit no hint that, as often happens, the method was really made up as the scientist went along, or that accidental results determined the method, or that the scientist reached certain conclusions before the results were all in, or that he started out with certain conclusions, or that he started doing a different experiment.   Much scientific writing not only misrepresents the workings of science but also does a disservice to scientists themselves. By writing reports that make scientific investigations sound as unvarying and predictable as the sunrise, scientists tend to spread the curious notion that science is infallible. That many of them are unconscious of the effect they create does not alter the image in the popular mind. We hear time and again of the superiority of the "scientific method". In fact, the word "unscientific" has almost become a synonym for "untrue". Yet the final evaluation of any set of data is an individual, subjective judgment; and all human judgment is liable to error. Thoughtful scientists realize all this; but you wouldn’’t gather so from reading most scientific literature. A self-important, stiff and unnatural style too often seizes the pen of the experimenter the moment he starts putting words on paper.   Editors of scientific publications are not without their reasons for the current style of scientific writing. Their journals aren’’t rich. Paper and printing are expensive. Therefore, it is helpful to condense articles as much as possible. Under pressure of tradition, the condensation process removes the human elements first. And few scientific writers rebel against the tradition. Even courageous men do not go out of their way to publicize their deviations from accepted procedures. Then ,too, there is an apparent objectivity and humbleness attached to the third person, passive voice writing technique adopted in the preparation of most scientific papers. So, bit by bit, the true face of science becomes hidden behind what seems to the outsider to be a self-satisfied all-knowing mask. Is it any wonder that in the popular literature the scientist often appears as a hybrid superman-spoiled child   No small contribution to modern culture could be the simple introduction, into the earliest stage of our public-school science courses, of a natural style of writing about laboratory experiments as they really happen. This is something that could be done immediately with the opening of classes this fall. It requires no preparation except a psychological acknowledgment of the obvious fact that the present form of reporting experiments is a mental tie whose very appearance is calculated to repel the imaginative young minds science so badly needs. The traditional demands on writing scientific papers

A. require well worked-out methods in experiment.
B. ask for elimination of any accidental outcomes.
C. refuse inconformity of conclusions with results.
D. conflict with actual conditions as often as not.
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A large proportion of the studies of behavior used animals as subjects, especially pigeons, rats, and rabbits. There are a number of reasons why researchers in this field frequently choose to conduct their experiments with nonhuman subjects. First of all, the possibility of a placebo effect is minimized with animal subjects. 46)Whereas a human subject’’s behavior may be drastically altered by the knowledge that he or she is being observed, this is unlikely with animal subjects because most studies with animal subjects are conducted in such a way that the animal does not know its behavior is being monitored and recorded. Furthermore, it is unlikely that an animal subject will be motivated either to please or displease the experimenter, a motive that can ruin a study with human subjects. A second reason for using animal subjects is convenience. The species most commonly used as subjects are easy and inexpensive to care for, and animals of a specific age and sex can be obtained in any quantities the experimenter needs. 47)Once animal subjects are obtained, their participation is as regular as the experimenter’’s--animal subjects never fail to show up for their appointments, which is unfortunately not the case with human subjects.48) Probably the biggest advantage of domesticated animal subjects is that their environment can be controlled to a much greater extent than is possible with either wild animals or human subjects. This is especially important in experiments on learning, where previous experience can have a large effect on a subject’’s performance in a new learning situation. Likewise, if a human subject tries to solve some mystery as part of a learning experiment, the experimenter cannot be sure how many similar problems the subject has encountered in his lifetime. 49) When animals are bred and raised in the laboratory, however, their environments can be constructed to make sure that they have no contact with objects or events similar to those they will encounter in the experiment.A final reason for using animal subjects is that of comparative simplicity. 50)Just as a child trying to learn electricity is better off starting with a flashlight than a radio, researchers may have a better chance of discovering the basic principles of learning by examining creatures that are less intelligent and less complex than human beings The assumption here is that although human beings differ from other animals in some respects, they are also similar in some respects, and it is these commonalities that can be investigated with animal subjects.