tailieunhanh - Sat - MC Grawhill part 21

Tham khảo tài liệu 'sat - mc grawhill part 21', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 190 McGRAW-HILL S SAT SAT Practice 5 Connecting the Questions to the Passage The following is an excerpt from a recent book by two science writers on the evolution of human intelligence. Where can freedom be found Perhaps in a flock of estuary birds Flying together at high Line speeds thousands of birds maneuver with precise coordination. The flock flies this way 5 and then that. It turns as if a wave has passed through it. These maneuver waves start slowly in a few individuals but quickly spread. Unless the individual birds reacted together the flock would disperse exposing isolated 10 birds to predators. Sometimes it is smart in a survival sense to give up your freedom and fit in with a group. Once started a wave travels through a flock at about 70 birds a second. Surprisingly this 15 is much faster than a single bird s reaction time. Thus individual birds cannot have seen their neighbors and said to themselves Hey they ve changed direction I d better copy them. Something else besides copying is 20 synchronizing the birds. Somehow they see themselves if only for a short time as part of a whole. They see the wave maneuver and time their own change of flight with it. Individuals cease to be individuals in many 25 ways not just when flying together. Humans can react physically as a group a wave of legs passes down a chorus line at roughly 10 dancers every second. As with birds taking off this is too fast for movements made in reaction 30 to neighbors. A similar thing no doubt at a deeper level organizes a jazz jam or a basketball team. This suggests that people are good surprisingly good at synthesizing their actions into a larger whole. Soldiers 35 marching in step with each other are not doing so as individuals. We all have a sense of we that identifies with our group and favors us against outsiders. We have our fraternities sororities 40 and other old boy and girl networks. We seek out people who share the same club school tie or accent. Much of this activity is