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 ruie 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 rehears
A. natural family relationships
B. quickly occurring family relationships
C. animals acting like a natural family
D. animal family behavior that cannot be preplanned or controlled
Insomnia (失眠) is the inability to sleep calmly and relaxedly. It is a problem to nearly everyone at some time. A person may be awake for an hour in the middle of the night and then,next morning, may feel that he hardly slept all night. Normally, worry about not getting enough sleep is the worst aspect of most insomnia. If insomnia occurs repeatedly, it is important to findits possible causes and try to correct them.
Any of simple factors may make one feel difficult to fall asleep. His mattress (床垫) may be too soft or too hard. If there are too many blankets (毯子) on a hot night, he may be too warm; if the mattress is too light he may feel cold during the night. The bedroom itself may be over heatedor too cold. If it is not dark enough, or too noisy, thismay cause difficulty in sleeping. Eating shortly before going to bed may also be responsible for insomnia. Drinking tea or coffee can also make people awake.
The cause of insomnia may be easy to correct. The suffere
A. eat appropriate amount of food
B. take a walk before going to bed
C. change its causes directly
D. have more reading before sleeping
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