A.find out the living conditions for squirrels |
B.learn squirrels’influence on black walnut trees |
C.do something to get rid of squirrels |
D.save the forests in the American state of Indiana |
A.the way they gather the walnut |
B.the time they have winter sleep |
C.the place they have winter sleep |
D.the place they store the walnuts |
A.red squirrels eat more nuts than gray squirrels |
B.gray squirrels and red squirrels will have severe fights |
C.red squirrel’s way to store nuts stops nuts growing. |
D.black walnuts are harmful to other animals |
A.The black walnut is equally attractive to both gray and red squirrels. |
B.Gray squirrels do more harm to the forest than red squirrels. |
C.Red squirrels and gray squirrels have helped the spread of walnut trees. |
D.The cleaning of forest land benefits red squirrels directly. |