Ⅱ.阅读理解(建议用时16′)

　　A

　　[2016·育才高三联考]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 gatheringW1 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 affectW2 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 centralW3 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 ofP1 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”．

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