Next fall, when you see geese heading south for the winter, flying along in "V" formation, you might consider what science has discovered as to why they fly that way. As each bird flaps its wings, it creates an up-lift for the bird immediately following. By flying in "V" formation, the whole flock adds at least 71 percent greater flying 1 than if each bird flew on its own. People who share a common direction and 2 of community can get 3 they are going more quickly and easily, because they are traveling 4 the thrust of one another. When a goose falls out of 5, it suddenly feels the drag and resistance 6 trying to go it alone and quickly gets back into the formation to take 7 of the lifting power of the bird 8 front. If we have as much sense as a goose, we will 9 in formation with those people who are 10 the same way we are. When the head goose gets tired, it 11 back in the wing and another goose flies to the 12. It is 13 to take turns doing demanding jobs, whether with people or with geese 14 south. Geese honk from behind to encourage those 15 front to keep up their speed. Finally, and this is important, when a goose gets sick or is 16 by gunshot, and falls out of formation, two other geese fall 17 with that goose and follow it down to 18 help and protection. They stay with the fallen goose until it is able to fly or 19; and only then do they launch out on their own, or with another formation to catch up with their group. If we have the sense of a goose, we will stand by each other 20 that.
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【正确答案】 1、A,    2、C,    3、B,    4、C,    5、C,    6、B,    7、D,    8、C,    9、C,    10、C,    11、A,    12、A,    13、A,    14、C,    15、D,    16、C,    17、C,    18、C,    19、C,    20、C    
【答案解析】