Gray squirrels are native toP2 Indiana. But Professor Swihart says their numbers began to decreaseW4 as more forests were cut for agriculture.S 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 invadeW5 Indiana. Jake Goheen calls them a sign of an environmental problem more than a cause.

　　本文为科普文，分析的是两种不同类型的松鼠为过冬储备食物的种类不同的原因，以及松鼠对这些植物的影响。

　　1．The study done by Rob Swihart and Jake Goheen is to

　　.

　　A．find out the living conditions for squirrels

　　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

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