完形填空
The Japanese Macaca monkey has been studied in the wild for over 50 years. In 1952 ,on one small Japanese island,scientists dropped some  1  dirt for the monkeys. The monkeys liked their taste,but they found the dirt  2 .
One clever 18-month-old monkey  3 the problem by washing the sweet potatoes in a nearby river. She taught this to her mother. Her   4  also learned this new way and they taught their mothers too.
All the younger monkeys   5  learned to wash the dirty sweet potatoes to make them6   to eat. But many found it very hard to learn this and still ate the  7 sweet potatoes.
Then something   8   .In the autumn of 1958,scientists found that the monkeys on other nearby   9   began washing their sweet potatoes too. Scientists still don't fully understand how this knowledge was   10  from one island to another.

(     )1.A. sweet potatoes
(     )2.A. beautiful
(     )3.A. find
(     )4.A. children
(     )5.A. quietly
(     )6.A. nicer
(     )7.A. small
(     )8.A. took on
(     )9.A. trees
(     )10.A. lost

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