B.do something to get rid of squirrels
C.learn squirrels' influence on black walnut trees
D.save the forests in the American state of Indiana
答案:C 细节理解题。根据第二段“The scientists wanted to know how these differences could affect the growth of black walnut trees.”可知。
2.The difference between gray squirrels and red squirrels mainly lies in ________.
A.the way they gather the walnut
B.the place they store the walnuts
C.the number of the nuts they can collect
D.the fact that the gray squirrels have a bad memory
答案:B 细节理解题。根据第三段“Gray squirrels and red squirrels do not store nuts and seeds in the same way.”可知。
3.When Professor Swihart says “death traps for seeds”, he actually means that ________.
A.nuts above the ground will not develop into plants
B.red squirrels eat more nuts than gray squirrels
C.gray squirrels and red squirrels will have severe fights
D.seeds can be traps for other animals in the forest
答案:A 句意猜测题。根据第三段倒数第二句“Red squirrels, however, store large groups of nuts above ground.”可知答案。
4.According to the passage, which of the following is TRUE?
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