Question

Winter begins in the north on December 22nd. People and animals have been doing what they always do to prepare for the cold months. Squirrels, for example, have been busy gathering nuts from trees. Well, scientists have been busy gathering information about what the squirrels do with the food they collect.

They examined differences between red squirrels and gray squirrels in the American state of Indiana. The scientists wanted to know how these differences could affect the growth of black walnut trees. The black walnut is the nut of choice for both kinds of squirrels. The black walnut tree is also a central part of some hardwood forests.

Rob Swihart of Purdue University did the study with Jake Goheen, a former Purdue student now at the University of New Mexico. The two researchers estimate that several times as many walnuts grow when gathered by gray squirrels as compared to red squirrels. Gray squirrels and red squirrels do not store nuts and seeds in the same way. Gray squirrels bury nuts one at a time in a number of places. But they seldom remember where they buried every nut. So some nuts remain in the ground. Conditions are right for them to develop and grow in the following spring. Red squirrels, however, store large groups of nuts above ground. Professor Swihart calls “death traps for seeds”.

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.

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

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

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

4.According to the passage, which of the following is true?

A. Gray squirrels do more harm to the forest than red squirrels.

B. Red squirrels and gray squirrels have helped the spread of walnut trees.

C. The cleaning of forest land benefits gray squirrels directly.

D. Human beings should bear some responsibility for the decreasing number of gray squirrels.

Answer

1.C

2.B

3.A

4.D

【解析】

试题分析：松鼠为过冬储藏粮食，研究表明红松鼠和灰松鼠储藏粮食的方法有所不同,对黑胡桃树的影响也不同。

1.C细节推理题。根据第二段The scientists wanted to know how these differences could affect the growth of black walnut trees.可知两个研究者通过实验知道松鼠对黑胡桃树的生长有何影响，故选C.

2.B细节推理题。根据第三段Gray squirrels bury nuts one at a time in a number of places.和Red squirrels, however, store large groups of nuts above ground.可知红松鼠和灰松鼠储藏坚果的地方不同，故选B.

3.A猜测词意题。根据第三段中提到的不同松鼠储藏坚果的地方不同可知，灰松鼠把坚果埋在许多地方，但记性又不好好多找不到，第二年会长成小树；而红松鼠在地上储藏坚果长不成小树，这被称为“种子的死亡陷阱”，故选A.

4.推理判断题。根据文意可知灰松鼠无意中促进了更多树木的生长和传播，故A,B错误。根据the cleaning of forest land for agriculture has helped red squirrels invade Indiana.可知对森林地面的清理让灰松鼠失去了食物，影响了树木的传播帮助了红松鼠，故C错误。根据最后一句可知人们要为灰松鼠数量的减少承担责任，故选D.

考点：考查环境保护类短文阅读。