多项选择题

19世纪，由于（），民主得到了真正发展的机会，从而在欧美发达国家实现了从理论向制度的转化。

A.市场经济的发展
B.教育的普及
C.社会等级观念的淡化
D.公民选举权的扩大
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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 experimentations 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 froe 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 a group-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 asideB.people who are not trained as biologistsC.people who are amateur biologistsD.people who love animals
A.B.
C.'
D.
In
E.
A.people
F.people
G.people
H.people
单项选择题
1999年通过的《中华人民共和国宪法修正案》将“依法治国，建设社会主义法治国家”载入宪法。（）
A.正确
B.错误
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