The Japanese Macaca monkey has been studied in the wild for over 50 years. In 1952, on one small Japanese island, scientists dropped some
36 dirt for the monkeys. The monkeys liked their taste, but they found the dirt
37 .
One clever 18-month-old monkey
38 the problem by washing the sweet potatoes in a nearby river, She taught this to her mother. Her
39 also learned this new way and they taught their mothers too.
All the younger monkeys
40 learned to wash the dirty sweet potatoes to make them
40 to eat. But many found it very hard to learn this and still ate the
42 sweet optatoes.
Then something very
43 . In the autumn of 1958, scientists found that the monkeys on other nearby
44 began washing their sweet potatoes too. Scientists still don’t fully understand how this knowledge was
45 from one island to another.
小题1: | A.sweet potatoes | B.green plants | C.hard stones | D.fresh nuts |
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小题2: | A.beautiful | B.terrible | C.difficult | D.interesting |
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小题3: | A.find | B.reach | C.solve | D.understand |
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小题4: | A.children | B.brothers | C.sisters | D.friends |
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小题5: | A.quietly | B.esily | C.angrily | D.awfully |
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小题6: | A.nicer | B.smaller | C.lighter | D.drier |
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小题7: | A.small | B.large | C.new | D.dirty |
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小题8: | A.took on | B.took off | C.took place | D.took away |
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小题9: | A.trees | B.islands | C.beaches | D.rivers |
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小题10: | A.lost | B.dropped | C.passed | D.left |
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