__4__ 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 (涌入) Indiana. __5__

　　A．Gray squirrels are native to Indiana.

　　B．But they seldom remember where they buried every nut.

　　C．Red squirrels bury nuts in a different way.

　　D．The black walnut is the nut of choice for both kinds of squirrels.

　　E．Jake Goheen calls them a sign of an environmental problem more than a cause.

　　F．Scientists are worried that they will drive away the gray squirrels.

　　G．Well, scientists have been busy gathering information about what the squirrels do with the food they collect.

　　本文为说明文，讲述的是研究发现松鼠在收集walnut时存在的一些不同，并通过研究寻找这些不同的原因。

　　1．G　根据下段“They examined differences between red squirrels and gray squirrels in the American state of Indiana.”可知该项中的scientists为关键信息。

　　2．D　根据空后句“The black walnut tree is also a central part of some...”中的also可知。

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