Gray squirrels are native to Indiana. But Professor Swihart says their numbers began to decrease as more forests were cut for agriculture. Red squirrels began to spread through the state during the past century.

　　The researchers say red squirrels are native to forests that stay green all year, unlike walnut trees. They say the cleaning of forest land for agriculture has helped red squirrels invade Indiana. Jake Goheen calls them a sign of an environmental problem more than a cause.

　　68.The study done by Rob

　　Swihart and Jake Goheen is to ____ .

　　A. Find out how squirrels collect walnuts

　　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

　　69.The difference between gray squirrels and red squirrels lies in ____.

　　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

　　70.What could be inferred from this text?

　　A. Agricultural in Indiana has been well developed

　　B. Gray squirrels will be replaced by red squirrels in Indiana.

　　C. The spread of red squirrels will do harm to walnuts trees in Indiana

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