题型:阅读选择 题类:模拟题 难易度:困难
江苏省连云港市赣榆区2020年九年级中考英语三模试卷
Monkeys seem to have a way with numbers.
A team of researchers trained three Rhesus monkeys to associate 26 clearly different symbols made up of numbers and selective letters with 0-25 drops of water or juice as a reward. The researchers then tested how the monkeys combined—or added—the symbols to get the reward.
Here's how Harvard Medical School scientist Margaret Livingstone, who led the team, described the experiment: In their cages the monkeys were provided with touch screens. On one part of the screen, a symbol would appear, and on the other side two symbols inside a circle were shown. For example, the number 7 would flash on one side of the screen and the other end would have 9 and 8. If the monkeys touched the left side of the screen they would be rewarded with seven drops of water or juice; if they went for the circle, they would be rewarded with the sum of the numbers—17 in this example.
After running hundreds of tests, the researchers noted that the monkeys would go for the higher values more than half the time, showing that they were performing a calculation(计算), not just remembering the value of each combination.
When the team studied the results of the experiment more closely, they noticed that the monkeys tended to underestimate(低估)a sum compared with a single symbol when the two were close in value—sometimes choosing, for example, a 13 over the sum of 8 and 6. The underestimation was systematic: When adding two numbers, the monkeys always paid attention to the larger of the two, and then added only a fraction(小部分)of the smaller number to it.
"This shows that there is a certain way number is represented in their brains, "Dr. Livingstone says. "But in this experiment what they're doing is paying more attention to the big number than the little one. "
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To begin the trip, we would like to draw your attention to the most important tips. Seat belts must remain fastened (扣住) while the"fasten seat belts" sign is on. All flights are non- smoking. The use of mobile telephones is not allowed.
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During most flights we serve you a tasty meal with drinks. Beer, wine and other drinks are served free of charge. Coffee, tea and juice are served free of charge on all flights of over 35 minutes.
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In this magazine you'll find a special form for your comments about our service. Kindly return the form to our crew or any Air- China office. You can also fax it or send your comments by email.
A. Your opinions are welcomed B. For your safety C. For your pleasure time D. Tips to make your trip safe and wonderful E. Meals and drinks F. History and culture |
Mike really loves to play ping-pong. If he can have a match with famous ping-pong players, he will be very excited. {#blank#}1{#/blank#} David is very interested in playing basketball. What he wants is to train with more basketball players. {#blank#}2{#/blank#} Jack is a middle school student. He is on the football team. He wants to enjoy exciting games in winter. {#blank#}3{#/blank#} Playing volleyball can help Cindy relaxed. She likes to play volleyball and plays volleyball twice a week. She also likes to watch volleyball games on TV. {#blank#}4{#/blank#} Anna is now a university student She likes running best because she thinks running is the easiest and the most interesting sports of all. {#blank#}5{#/blank#} | A. A Volleyball Game Are you a volleyball fan? There will be a lot of big volleyball games on TV this weekend. Many famous volleyball players will play together. Don't miss them. B. A Football Match Some famous football players will begin their training in July in Shenzhen. At the end of August, they will have a match. It must be exciting. C. A Basketball Game There will be a basketball game. Each team has three players in this game. The ones who are great in the game will have a chance of training. D. A Ping-pong Match There will be a match on TV between Ma Long and Xu Xin, the top players in the world. Enjoy the match tonight! E. A Marathon Race Many people love running. Are you one of them? This winter our city will hold a marathon (马拉松). If you are more than 16, you can be one of us. F. A Ping-pong Competition A ping-pong competition is waiting for you in the Sports Center. Some famous players will be there. You can play with them to improve yourself. G. 2022 FIFA World Cup The 2022 FIFA World Cup will start on November 21. It is the first time FIFA has moved the match from its traditional summer to winter. Many top football teams will appear at that time. |
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