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【单选题】
For laymen ethnology is probably the most interesting of the biological sciences for the very reason that it concerns animals in their normal activities and therefore, if we wish, we can assess the possible dangers and advantages in our own behavioral roots. Ethnology also is interesting methodologically because it combines in new ways very scrupulous field observations with experimentation in laboratories. The field workers have had some handicaps in winning respect for themselves. For a long time they were considered as little better than amateur animal-watchers certainly not scientists, since their facts were not gained by experimental procedures: they could not conform. to the hard-and-fast rule that a problem set up and solved by one scientist must be tested by other scientists, under identical conditions and reaching identical results. Of course many situations in the lives of animals simply cannot be rehearsed and controlled in this way. The fall flocking of wild free birds can't be, or the homing of animals over long distances, or even details of spontaneous family relationships. Since these never can be reproduced in a laboratory, are they then not worth knowing about? The ethnologists who choose field work have got themselves out of this impasse by greatly refining the techniques of observing. At the start of a project all the animals to be studied are live-trapped, marked individually, and released. Motion pictures, often in color, provide permanent records of their subsequent activities. Recording of the animals' voices by electrical sound equipment is considered essential, and the most meticulous notes are kept of all that occurs. With this material other biologists, far from the scene, later can verify the reports. Moreover, two field observers often go out together, checking each other's observations right there in the field. Ethnology, the word, is derived from the Greek ethos, meaning the characteristic traits or features which distinguish any particular group of people or, in biology, a group of animals such as a species. Ethnologists have the intention of studying 'the whole sequence of acts which constitute an animal's behavior.' In abridged dictionaries ethnology is sometimes defined simply as 'the objective study of animal behavior,' and ethnologists do emphasize their wish to eliminate myths. In the first sentence, the word 'laymen' means ______.
A.
people who stand aside
B.
people who are not trained as biologists
C.
people who are amateur biologists
D.
people who love animals
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举一反三
【判断题】我国目前常用的天然气臭味剂是四氢噻吩。
A.
正确
B.
错误
【单选题】It's impossible for me to pass the exam.
A.
幸运的
B.
不可能的
C.
自信的
【判断题】我国目前常用的天然气臭味剂是四氢噻吩。
A.
正确
B.
错误
【简答题】晶体管在高频工作时,频率越高,电流放大系数( )。
【单选题】晶体管在高频工作时频率越高,电流放大系数越小,导致晶体管的( )下降,限制了晶体管在高频的应用范围。
A.
放大能力
B.
电流
C.
电压
D.
功率
【判断题】由于每个flas中只有一个舞台,所以 ActionScript 3.0 不允许用户创建Stage类的对象,但可以使用其他特定类对象的函数间接访问该类中的属性。
A.
正确
B.
错误
【单选题】It's hard for me to say hello to strangers.
A.
奇怪的人
B.
陌生人
C.
熟人
【多选题】详细设计的原则主要包括 ( )。
A.
可靠原则
B.
明晰原则
C.
结构化设计原则
D.
适当工具原则
E.
共享原则
【简答题】听句子。选择最佳答语。 1. It's time for me to go to school. A. I think It's time for school. B. I like to go to school. C. I go to school. D. I want to go to school. 2. I'd like to go to the store. A. I want to ...
【判断题】晶体管在低频工作时,电流放大系数常看成与频率无关的常数。但在高频工作时,频率越高,电流放大系数越小。直接导致管子的放大能力下降,限制了晶体管在高频范围的应用。
A.
正确
B.
错误
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