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| 文章出处：学生大考试站 发布时间：2005-10-12 |
SectionⅠUse of English
Directions：
Read the following text.Choose the best word（s）for each numbered blank and mark A，B，C or D on ANSWER SHEET 1.（10 points）
In the past few decades，remarkable findings have been made in ethology，the study of animal social behavior. Earlier scientists had 1 that nonhuman social life was almost totally instinctive or fixed by genetics. Much more careful observation has shown that 2 variation occurs among the social ties of most species，showing that learning is a part of social life. That is，the 3 are not solely fixed by the genes.
4，the learning that occurs is often at an early age in a process that is called imprinting. Imprinting is clearly 5 instinctive，but it is not quite like the learning of humans；it is something in between the two. An illustration best 6 the nature of imprinting. Once，biologists thought that ducklings followed the mother duck because of instincts. Now we know that，shortly 7 they hatch，ducklings fix 8 any object about the size of a duck and will henceforth follow it. So ducklings may follow a basketball or a briefcase if these are 9 for the mother duck at the time when imprinting occurs. Thus，social ties can be considerably 10，even ones that have a considerable base 11 by genetics.
Even among the social insects something like imprinting 12 influence social behavior
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