完形填空TheJapaneseMacacamonkeyhasbeen

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 some1dirt for the monkeys. The monkeys liked their taste, but they found the dirt2.One clever 18-month-old monkey3the problem by washing the sweet potatoes in a nearby river, She taught this to her mother. Her4also learned this new way and they taught their mothers too.All the younger monkeys5learned to wash the dirty sweet potatoes to make them6to eat. But many found it very hard to learn this and still ate the7sweet optatoes.Then something very8. In the autumn of 1958, scientists found that the monkeys on other nearby9began washing their sweet potatoes too. Scientists still don’t fully understand how this knowledge was10from one island to another.1.A.sweet potatoesB.green plantsC.hard stonesD.fresh nuts2.A.beautifulB.terribleC.difficultD.interesting3.A.findB.reachC.solveD.understand4.A.childrenB.brothersC.sistersD.friends5.A.quietlyB.esilyC.angrilyD.awfully6.A.nicerB.smallerC.lighterD.drier7.A.smallB.largeC.newD.dirty8.A.took onB.took offC.took placeD.took away9.A.treesB.islandsC.beachesD.rivers10.A.lostB.droppedC.passedD.left