Spider monkeys know that the best way to find food is in a group.But when they divide to hunt for fruit，there's no random （隨意的） pairing off.Researchers have found that they use collective computation （群體計(jì)算） when they break up into teams.
Typically，the older females lead the rest of the younger monkeys， having the final say in group activities.But that's not the case for wild spider monkeys living in a protected area near Punta Laguna，Mexico.
When they're ready to search for food，the monkeys form teams without a single leader picking who goes into which group.Instead，each monkey decides^which group to join and when to move to another group.The result，say researchers，is that the monkeys are collectively computing good team sizes given the availability （可獲性） of food in the forest.
"The spider monkeys seem to be collecting information about resources by forming these small teams，so that as a group they know their environment better than anyone does on its own，" lead study author，Gabriel Ramos-Fernandez of the National Autonomous University of Mexico，said.
To study the animals' behavior，researchers spent two years recording 47 different spider monkeys for five hours each day.For hunting for food，they usually formed groups of 2 to 17 monkeys.Researchers worked together with the scientists at the Santa Fe Institute in New Mexico to find out how a spider monkey decided to stay with or leave a group.Their study found that the monkeys，decisions were influenced by the decisions of the other monkeys on the team.They would feel out their teammates about the best size and then make their own decisions accordingly.
The results produced teams of many different sizes，which were helpful in finding fruit in the forest.The researchers said that the collectively computed sizes were sometimes not a perfect match based on the food that was available.They suggest a similar study should be used to examine how other groups or systems work，such as flocks of birds or schools of fish.
（1）How do spider monkeys living near Punta Laguna differ from the typical ones？ BB
A．They can live better even in bad weather conditions.
B．The sizes of their teams are decided by each of them.
C．The older monkeys play a leading role in a team.
D．They usually take turns to look for food.
（2）How do you understand the underlined part in Paragraph 2？ CC
A．Spreading the word.
B．Winning all the games.
C．Making the final decisions.
D．Getting the most delicious food.
（3）What will probably cause a spider monkey to leave its team？ AA
A．Its teammates' choices.
B．The sudden danger that appears.
C．The unfair treatment from teammates.
D．Its disappointment with the amount of food.
（4）What can we learn from the last paragraph？ BB
A．Spider monkeys can't offer help to each other in a group.
B．Spider monkeys' collective computation is not always useful.
C．The researchers will do a further study about spider monkeys.
D．Birds also use collective computation when they form groups.
【考點(diǎn)】說(shuō)明文．
【答案】B；C；A；B
【解答】
【點(diǎn)評(píng)】
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發(fā)布：2024/5/27 14:0:0組卷：0引用：1難度：0.6
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