单项选择题

We sometimes hear that essays are an old-fashioned form. that so-and-so is the "last essayist", but the facts of the marketplace argue quite otherwise. Essays of nearly any kind are so much easier than short stories for a writer to sell, so many more see print, it’’s strange that though two fine anthologies (collections)remain that publish the year’’s best stories, no comparable collection exists for essays. Such changes in the reading public’’s taste aren’’t always to the good, needless to say. The art of telling stories predated even cave painting, surely; and if we ever find ourselves living in caves again, it (with painting and drumming)will be the only art left, after movies, novels, photography, essays ,biography, and all the rest have gone down the drain―the art to build from.   Essays, however, hang somewhere on a line between two sturdy poles: this is what I think, and this is what I am. Autobiographies which aren’’t novels are generally extended essays, indeed. A personal essay is like the human voice talking, its order being the mind’’s natural flow, instead of a systematized outline of ideas. Though more changeable or informal than an article or treatise, somewhere it contains a point which is its real center, even if the point couldn’’t be uttered in fewer words than the essayist has used. Essays don’’t usually boil down to a summary, as articles do, and the style of the writer has a "nap" to it, a combination of personality and originality and energetic loose ends that stand up like the nap( 绒毛)on a piece of wool and can’’t be brushed flat. Essays belong to the animal kingdom, with a surface that generates sparks, like a coat of fur, compared with the flat, conventional cotton of the magazine article writer, who works in the vegetable kingdom, instead. But, essays, on the other hand, may have fewer "levels" than fiction, because we are not supposed to argue much about their meaning. In the old distinction between teaching and storytelling, the essayist, however cleverly he tries to conceal his intentions, is a bit of a teacher or reformer, and an essay is intended to convey the same point to each of us.   An essayist doesn’’t have to tell the whole truth and nothing but the truth; he can shape or shave his memories, as long as the purpose is served of explaining a truthful point. A personal essay frequently is not autobiographical at alt, but what it does keep in common with autobiography is that, through its tone and tumbling progression, it conveys the quality of the author’’s mind. Nothing gets in the way. Because essays are directly concerned with the mind and the mind’’s peculiarity, the very freedom the mind possesses is conferred on this branch of literature that does honor to it, and the fascination of the mind is the fascination of the essay. The author asserts that the changes in readers’’ taste

A. contribute to the incompatibility of essays with stories.
B. often result in unfavorable effect, to say the least.
C. sometimes come to something undesirable, of course.
D. usually bring about beneficial outcome, so to say.
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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.