Section ⅠUse 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.

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