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 小题9: A．trees B．islands C．beaches D．rivers 小题10: A．lost B．dropped C．passed D．left