The Japanese Macaca monkey has been studied in the wild for over 50 years. In 1952, on one small Japanese island, scientists dropped some
26 in the dirt for the monkeys. The monkeys liked their taste, but they found the dirt 27 .
One clever 18-month-old monkey found she could
28 the problem by washing the sweet potatoes in a nearby river. She taught this to her mother. Her
29 also learned this new way and they taught their mothers, too.
All the younger monkeys
30 learned to wash the dirty sweet potatoes to make them
31 to eat. But many old monkeys found it very hard to learn this and still ate the
32 sweet potatoes.
Then something very surprising
33 . In the autumn of 1958, scientists found that the monkeys on other nearby
34 began washing their sweet potatoes too. Scientists still don’t fully understand how this knowledge was
35 from one island to another.
| 小题1: | | A．sweet potatoes | B．green plants | | C．hard stones | D．fresh nuts |
|
| 小题2: | | A．beautiful | B．terrible | | C．difficult | D．interesting |
|
| 小题3: | | A．find | B．reach | C．solve | D．understand |
|
| 小题4: | | A．children | B．brothers | C．sisters | D．friends |
|
| 小题5: | | A．quietly | B．easily | C．angrily | D．awfully |
|
| 小题6: | | A．nicer | B．smaller | C．lighter | D．drier |
|
| 小题7: | | A．small | B．large | C．new | D．dirty |
|
| 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 |
|
| 小题10: | | A．lost | B．dropped | C．passed | D．left |
|
